Question Bank: Classification of Elements & Periodicity in Properties | Chemistry Class 11 - NEET PDF Download

 Page 1


 
 
Nomenclature of Elements with Atomic 
Numbers > 100 
1. Identify the incorrect match.
Name IUPAC Official Name 
(A) Unnilunium (i) Mendelevium
(B) Unniltrium (ii) Lawrencium
(C) Unnilhexium (iii) Seaborgium
(D) Unununnium (iv) Darmstadtium
(a) (A), (i) (b) (B), (ii)
(c) (C), (iii) (d) (D), (iv)
(NEET 2020) 
Electronic Configurations of Elements 
and The Periodic Table 
2. The element Z = 114 has been discovered recently. It
will belong to which of the following family/group
and electronic configuration?
(a) Carbon family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
2
 
(b) Oxygen family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
4
 
(c) Nitrogen family, [Rn] 5f
14 
6d
10 
7s
2 
7p
6
 
(d) Halogen family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
5
 
(NEET 2017) 
3. An atom has electronic configuration
1s
2 
2s
2 
2p
6 
3s
2 
3p
6 
3d
3 
4s
2
, you will place it in
(a) fifth group (b) fifteenth group
(c) second group (d) third group. (2002) 
4. The electronic  configuration  of  an  element  is
1s
2 
2s
2 
2p
6 
3s
2 
3p
3
. What is the atomic number of the
element, which is just below the above element in
the periodic table?
(a) 3 6 (b) 49
(c) 33 (d) 34 (1995) 
5. If the atomic number of an element is 33, it will be
placed in the periodic table in the
(a) first group (b) third group
(c) fifth group (d) seventh group. (1993)
6. The electronic configuration of four elements are
given below. Which elements does not belong to the
same family as others?
(a) [Xe]4f 
14
5d
10
4s
2 
(b) [Kr]4d
10
5s
2
 
(c) [Ne]3s
2
3p
5 
(d) [Ar]3d
10
4s
2 
(1989)
Periodic Trends in Properties of Elements
7. For the second period elements the correct increasing
order of first ionization enthalpy is
(a) Li < Be < B < C < O < N < F < Ne
(b) Li < Be < B < C < N < O < F < Ne
(c) Li < B < Be < C < O < N < F < Ne
(d) Li < B < Be < C < N < O < F < Ne (NEET 2019)
8. Match the oxide given in column I with its property
given in column II.
Column I Column II
(i) Na 2 O A. Neutral
(ii) Al 2O 3 B. Basic
(iii) N 2 O C. Acidic
(iv) Cl 2O7 D. Amphoteric
Which of the following options has all correct pairs?
(a) (i)-B, (ii)-A, (iii)-D, (iv)-C
(b) (i)-C, (ii)-B, (iii)-A, (iv)-D
(c) (i)-A, (ii)-D, (iii)-B, (iv)-C
(d) (i)-B, (ii)-D, (iii)-A, (iv)-C (Odisha NEET 2019)
9. Which of the following oxides is most acidic in nature?
(a) MgO (b) BeO
(c) BaO (d) CaO (NEET 2018) 
10. In which of the following options the order of
arrangement does not agree with the variation of
property indicated against it?
(a) I < Br < Cl < F (increasing electron gain
enthalpy)
(b) Li < Na < K < Rb (increasing metallic radius)
(c) Al
3+ 
< Mg
2+ 
< Na
+ 
< F
– 
(increasing ionic size)
(d) B < C < N < O (increasing first ionisation
enthalpy) (NEET-I 2016) 
3.4 
3.5 
3.7 
Page 2


 
 
Nomenclature of Elements with Atomic 
Numbers > 100 
1. Identify the incorrect match.
Name IUPAC Official Name 
(A) Unnilunium (i) Mendelevium
(B) Unniltrium (ii) Lawrencium
(C) Unnilhexium (iii) Seaborgium
(D) Unununnium (iv) Darmstadtium
(a) (A), (i) (b) (B), (ii)
(c) (C), (iii) (d) (D), (iv)
(NEET 2020) 
Electronic Configurations of Elements 
and The Periodic Table 
2. The element Z = 114 has been discovered recently. It
will belong to which of the following family/group
and electronic configuration?
(a) Carbon family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
2
 
(b) Oxygen family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
4
 
(c) Nitrogen family, [Rn] 5f
14 
6d
10 
7s
2 
7p
6
 
(d) Halogen family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
5
 
(NEET 2017) 
3. An atom has electronic configuration
1s
2 
2s
2 
2p
6 
3s
2 
3p
6 
3d
3 
4s
2
, you will place it in
(a) fifth group (b) fifteenth group
(c) second group (d) third group. (2002) 
4. The electronic  configuration  of  an  element  is
1s
2 
2s
2 
2p
6 
3s
2 
3p
3
. What is the atomic number of the
element, which is just below the above element in
the periodic table?
(a) 3 6 (b) 49
(c) 33 (d) 34 (1995) 
5. If the atomic number of an element is 33, it will be
placed in the periodic table in the
(a) first group (b) third group
(c) fifth group (d) seventh group. (1993)
6. The electronic configuration of four elements are
given below. Which elements does not belong to the
same family as others?
(a) [Xe]4f 
14
5d
10
4s
2 
(b) [Kr]4d
10
5s
2
 
(c) [Ne]3s
2
3p
5 
(d) [Ar]3d
10
4s
2 
(1989)
Periodic Trends in Properties of Elements
7. For the second period elements the correct increasing
order of first ionization enthalpy is
(a) Li < Be < B < C < O < N < F < Ne
(b) Li < Be < B < C < N < O < F < Ne
(c) Li < B < Be < C < O < N < F < Ne
(d) Li < B < Be < C < N < O < F < Ne (NEET 2019)
8. Match the oxide given in column I with its property
given in column II.
Column I Column II
(i) Na 2 O A. Neutral
(ii) Al 2O 3 B. Basic
(iii) N 2 O C. Acidic
(iv) Cl 2O7 D. Amphoteric
Which of the following options has all correct pairs?
(a) (i)-B, (ii)-A, (iii)-D, (iv)-C
(b) (i)-C, (ii)-B, (iii)-A, (iv)-D
(c) (i)-A, (ii)-D, (iii)-B, (iv)-C
(d) (i)-B, (ii)-D, (iii)-A, (iv)-C (Odisha NEET 2019)
9. Which of the following oxides is most acidic in nature?
(a) MgO (b) BeO
(c) BaO (d) CaO (NEET 2018) 
10. In which of the following options the order of
arrangement does not agree with the variation of
property indicated against it?
(a) I < Br < Cl < F (increasing electron gain
enthalpy)
(b) Li < Na < K < Rb (increasing metallic radius)
(c) Al
3+ 
< Mg
2+ 
< Na
+ 
< F
– 
(increasing ionic size)
(d) B < C < N < O (increasing first ionisation
enthalpy) (NEET-I 2016) 
3.4 
3.5 
3.7 
(g) 
( g 
2 
( g ) ( g ) 
Classification of Elements and Periodicity in Properties 17 
11. The formation of the oxide ion, O
2– 
from oxygen 
atom requires first an exothermic and then an 
endothermic step as shown below : 
O
( g ) 
? e 
? 
? O
? 
)
; ? 
f 
H?? ? 141 kJ mol 
?1
 
16. What is the value of electron gain enthalpy of Na
+ 
if 
IE 1 of Na = 5.1 eV? 
(a) –5.1 eV (b) –10.2 eV 
(c) +2.55 eV (d) +10.2 eV(Mains 2011) 
O
?
 ? e 
?
 ? O
2 ?
 ; ??
?
f 
H?? ? 780 kJ mol 
? 1
 
17. Which of the following oxides is amphoteric? 
(a) SnO2 (b) CaO 
Thus, process of formation of O
2–  
in gas phase is 
unfavourable even though O
2–  
is isoelectronic with 
(c) SiO2 (d) CO2 (Mains 2011) 
neon. It is due to the fact that, 
(a) O
– 
ion has comparatively smaller size than 
oxygen atom 
(b) oxygen is more electronegative 
(c) addition of electron in oxygen results in larger 
size of the ion 
(d) electron repulsion outweighs the stability gained 
by achieving noble gas configuration. (2015) 
12. Which of the following orders of ionic radii is 
correctly represented? 
(a)  H
–  
> H
+ 
> H (b) Na
+ 
> F
– 
> O
2– 
(c)  F
–  
> O
2– 
> Na
+ 
(d) Al
3+ 
> Mg
2+ 
> N
3–
 
(2014) 
13. Which one of the following arrangements represents 
the correct order of least negative to most negative 
electron gain enthalpy for C, Ca, Al, F and O? 
(a) Al < Ca < O < C < F 
(b) Al < O < C < Ca < F 
(c) C < F < O < Al < Ca 
(d) Ca < Al < C < O < F (Karnataka NEET 2013) 
14. In which of the following arrangements the given 
sequence is not strictly according to the property 
indicated against it? 
(a) HF < HCl < HBr < HI : increasing acidic strength 
(b) H O < H S < H Se < H Te : increasing p K values 
18. The correct order of the decreasing ionic radii 
among the following isoelectronic species is 
(a) Ca
2+ 
> K
+ 
> S
2– 
> Cl
–
 
(b) Cl
– 
> S
2– 
> Ca
2+ 
> K
+
 
(c) S
2– 
> Cl
– 
> K
+ 
> Ca
2+
 
(d)  K
+ 
> Ca
2+ 
> Cl
– 
> S
2– 
(2010) 
19. Which of the following represents the correct order 
of increasing electron gain enthalpy with negative 
sign for the elements O, S, F and Cl? 
(a) Cl < F < O < S (b) O < S < F < Cl 
(c) F < S < O < Cl (d) S < O < Cl < F 
(2010, 2005) 
20. Among the elements Ca, Mg, P and Cl, the order of 
increasing atomic radii is 
(a) Mg < Ca < Cl < P (b) Cl < P < Mg < Ca 
(c) P < Cl < Ca < Mg (d) Ca < Mg < P < Cl 
(Mains 2010) 
21. Among the following which one has the highest 
cation to anion size ratio? 
(a) CsI (b) CsF 
(c) LiF (d) NaF (Mains 2010) 
22. Amongst the elements with following electronic 
configurations, which one of them may have the 
highest ionisation energy? 
(a)  Ne [3s
2 
3p
2
] (b) Ar [3d
10 
4s
2 
4p
3
] 
2 2 2 2 
a
 (c)  Ne [3s
2 
3p
1
] (d)  Ne [3s
2 
3p
3
] (2009) 
(c) NH 3 < PH 3 < AsH 3 < SbH 3 : increasing acidic 
character 
(d) CO 2 < SiO 2 < SnO 2 < PbO 2 : increasing oxidising 
power (Mains 2012) 
15. Identify the wrong statement in the following. 
(a) Amongst isoelectronic species, smaller the 
positive charge on the cation, smaller is the 
ionic radius. 
(b) Amongst isoelectronic species, greater the 
negative charge on the anion, larger is the ionic 
radius. 
(c) Atomic radius of the elements increases as one 
moves down the first group of the periodic table. 
(d) Atomic radius of the elements decreases as one 
moves across from left to right in the 2
nd 
period 
of the periodic table. (2012) 
23. Identify the correct order of the size of the following. 
(a) Ca
2+ 
< K
+ 
< Ar < Cl
– 
< S
2–
 
(b) Ar < Ca
2+ 
< K
+ 
< Cl
– 
< S
2–
 
(c) Ca
2+ 
< Ar < K
+ 
< Cl
– 
< S
2–
 
(d)  Ca
2+ 
< K
+ 
< Ar < S
2– 
< Cl
– 
(2007) 
24. With which of the following electronic configuration 
an atom has the lowest ionisation enthalpy? 
(a)  1s
2 
2s
2 
2p
3 
(b) 1s
2 
2s
2 
2p
5 
3s
1
 
(c)  1s
2 
2s
2 
2p
6 
(d)  1s
2 
2s
2 
2p
5 
(2007) 
25. Which one of the following ionic species has the 
greatest proton affinity to form stable compound? 
(a) NH 
– 
(b) F
–
 
(c)  I
– 
(d) HS
– 
(2007) 
Page 3


 
 
Nomenclature of Elements with Atomic 
Numbers > 100 
1. Identify the incorrect match.
Name IUPAC Official Name 
(A) Unnilunium (i) Mendelevium
(B) Unniltrium (ii) Lawrencium
(C) Unnilhexium (iii) Seaborgium
(D) Unununnium (iv) Darmstadtium
(a) (A), (i) (b) (B), (ii)
(c) (C), (iii) (d) (D), (iv)
(NEET 2020) 
Electronic Configurations of Elements 
and The Periodic Table 
2. The element Z = 114 has been discovered recently. It
will belong to which of the following family/group
and electronic configuration?
(a) Carbon family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
2
 
(b) Oxygen family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
4
 
(c) Nitrogen family, [Rn] 5f
14 
6d
10 
7s
2 
7p
6
 
(d) Halogen family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
5
 
(NEET 2017) 
3. An atom has electronic configuration
1s
2 
2s
2 
2p
6 
3s
2 
3p
6 
3d
3 
4s
2
, you will place it in
(a) fifth group (b) fifteenth group
(c) second group (d) third group. (2002) 
4. The electronic  configuration  of  an  element  is
1s
2 
2s
2 
2p
6 
3s
2 
3p
3
. What is the atomic number of the
element, which is just below the above element in
the periodic table?
(a) 3 6 (b) 49
(c) 33 (d) 34 (1995) 
5. If the atomic number of an element is 33, it will be
placed in the periodic table in the
(a) first group (b) third group
(c) fifth group (d) seventh group. (1993)
6. The electronic configuration of four elements are
given below. Which elements does not belong to the
same family as others?
(a) [Xe]4f 
14
5d
10
4s
2 
(b) [Kr]4d
10
5s
2
 
(c) [Ne]3s
2
3p
5 
(d) [Ar]3d
10
4s
2 
(1989)
Periodic Trends in Properties of Elements
7. For the second period elements the correct increasing
order of first ionization enthalpy is
(a) Li < Be < B < C < O < N < F < Ne
(b) Li < Be < B < C < N < O < F < Ne
(c) Li < B < Be < C < O < N < F < Ne
(d) Li < B < Be < C < N < O < F < Ne (NEET 2019)
8. Match the oxide given in column I with its property
given in column II.
Column I Column II
(i) Na 2 O A. Neutral
(ii) Al 2O 3 B. Basic
(iii) N 2 O C. Acidic
(iv) Cl 2O7 D. Amphoteric
Which of the following options has all correct pairs?
(a) (i)-B, (ii)-A, (iii)-D, (iv)-C
(b) (i)-C, (ii)-B, (iii)-A, (iv)-D
(c) (i)-A, (ii)-D, (iii)-B, (iv)-C
(d) (i)-B, (ii)-D, (iii)-A, (iv)-C (Odisha NEET 2019)
9. Which of the following oxides is most acidic in nature?
(a) MgO (b) BeO
(c) BaO (d) CaO (NEET 2018) 
10. In which of the following options the order of
arrangement does not agree with the variation of
property indicated against it?
(a) I < Br < Cl < F (increasing electron gain
enthalpy)
(b) Li < Na < K < Rb (increasing metallic radius)
(c) Al
3+ 
< Mg
2+ 
< Na
+ 
< F
– 
(increasing ionic size)
(d) B < C < N < O (increasing first ionisation
enthalpy) (NEET-I 2016) 
3.4 
3.5 
3.7 
(g) 
( g 
2 
( g ) ( g ) 
Classification of Elements and Periodicity in Properties 17 
11. The formation of the oxide ion, O
2– 
from oxygen 
atom requires first an exothermic and then an 
endothermic step as shown below : 
O
( g ) 
? e 
? 
? O
? 
)
; ? 
f 
H?? ? 141 kJ mol 
?1
 
16. What is the value of electron gain enthalpy of Na
+ 
if 
IE 1 of Na = 5.1 eV? 
(a) –5.1 eV (b) –10.2 eV 
(c) +2.55 eV (d) +10.2 eV(Mains 2011) 
O
?
 ? e 
?
 ? O
2 ?
 ; ??
?
f 
H?? ? 780 kJ mol 
? 1
 
17. Which of the following oxides is amphoteric? 
(a) SnO2 (b) CaO 
Thus, process of formation of O
2–  
in gas phase is 
unfavourable even though O
2–  
is isoelectronic with 
(c) SiO2 (d) CO2 (Mains 2011) 
neon. It is due to the fact that, 
(a) O
– 
ion has comparatively smaller size than 
oxygen atom 
(b) oxygen is more electronegative 
(c) addition of electron in oxygen results in larger 
size of the ion 
(d) electron repulsion outweighs the stability gained 
by achieving noble gas configuration. (2015) 
12. Which of the following orders of ionic radii is 
correctly represented? 
(a)  H
–  
> H
+ 
> H (b) Na
+ 
> F
– 
> O
2– 
(c)  F
–  
> O
2– 
> Na
+ 
(d) Al
3+ 
> Mg
2+ 
> N
3–
 
(2014) 
13. Which one of the following arrangements represents 
the correct order of least negative to most negative 
electron gain enthalpy for C, Ca, Al, F and O? 
(a) Al < Ca < O < C < F 
(b) Al < O < C < Ca < F 
(c) C < F < O < Al < Ca 
(d) Ca < Al < C < O < F (Karnataka NEET 2013) 
14. In which of the following arrangements the given 
sequence is not strictly according to the property 
indicated against it? 
(a) HF < HCl < HBr < HI : increasing acidic strength 
(b) H O < H S < H Se < H Te : increasing p K values 
18. The correct order of the decreasing ionic radii 
among the following isoelectronic species is 
(a) Ca
2+ 
> K
+ 
> S
2– 
> Cl
–
 
(b) Cl
– 
> S
2– 
> Ca
2+ 
> K
+
 
(c) S
2– 
> Cl
– 
> K
+ 
> Ca
2+
 
(d)  K
+ 
> Ca
2+ 
> Cl
– 
> S
2– 
(2010) 
19. Which of the following represents the correct order 
of increasing electron gain enthalpy with negative 
sign for the elements O, S, F and Cl? 
(a) Cl < F < O < S (b) O < S < F < Cl 
(c) F < S < O < Cl (d) S < O < Cl < F 
(2010, 2005) 
20. Among the elements Ca, Mg, P and Cl, the order of 
increasing atomic radii is 
(a) Mg < Ca < Cl < P (b) Cl < P < Mg < Ca 
(c) P < Cl < Ca < Mg (d) Ca < Mg < P < Cl 
(Mains 2010) 
21. Among the following which one has the highest 
cation to anion size ratio? 
(a) CsI (b) CsF 
(c) LiF (d) NaF (Mains 2010) 
22. Amongst the elements with following electronic 
configurations, which one of them may have the 
highest ionisation energy? 
(a)  Ne [3s
2 
3p
2
] (b) Ar [3d
10 
4s
2 
4p
3
] 
2 2 2 2 
a
 (c)  Ne [3s
2 
3p
1
] (d)  Ne [3s
2 
3p
3
] (2009) 
(c) NH 3 < PH 3 < AsH 3 < SbH 3 : increasing acidic 
character 
(d) CO 2 < SiO 2 < SnO 2 < PbO 2 : increasing oxidising 
power (Mains 2012) 
15. Identify the wrong statement in the following. 
(a) Amongst isoelectronic species, smaller the 
positive charge on the cation, smaller is the 
ionic radius. 
(b) Amongst isoelectronic species, greater the 
negative charge on the anion, larger is the ionic 
radius. 
(c) Atomic radius of the elements increases as one 
moves down the first group of the periodic table. 
(d) Atomic radius of the elements decreases as one 
moves across from left to right in the 2
nd 
period 
of the periodic table. (2012) 
23. Identify the correct order of the size of the following. 
(a) Ca
2+ 
< K
+ 
< Ar < Cl
– 
< S
2–
 
(b) Ar < Ca
2+ 
< K
+ 
< Cl
– 
< S
2–
 
(c) Ca
2+ 
< Ar < K
+ 
< Cl
– 
< S
2–
 
(d)  Ca
2+ 
< K
+ 
< Ar < S
2– 
< Cl
– 
(2007) 
24. With which of the following electronic configuration 
an atom has the lowest ionisation enthalpy? 
(a)  1s
2 
2s
2 
2p
3 
(b) 1s
2 
2s
2 
2p
5 
3s
1
 
(c)  1s
2 
2s
2 
2p
6 
(d)  1s
2 
2s
2 
2p
5 
(2007) 
25. Which one of the following ionic species has the 
greatest proton affinity to form stable compound? 
(a) NH 
– 
(b) F
–
 
(c)  I
– 
(d) HS
– 
(2007) 
18 
26. Which of the following is the most basic oxide? 
(a) SeO2 (b) Al 2O3 
(c) Sb 2O3 (d) Bi 2O3 (2006) 
27. What is the correct relationship between the pH of 
isomolar solutions of sodium oxide, Na 2O (pH 1 ), 
sodium sulphide, Na S (pH ), sodium selenide, 
34. Which one of the following is correct order of the 
size of iodine species? 
(a)  I
+  
> I
– 
> I (b) I
– 
> I > I
+
 
(c)  I > I
– 
> I
+ 
(d)  I > I
+ 
> I
– 
(1997) 
35. Which of the following ions is the largest in size? 
(a) K
+ 
(b) Ca
2+
 
2
 
2
 (c) Cl
– 
(d) S
2– 
(1996) 
Na 2 Se (pH 3) and sodium telluride Na 2Te (pH 4)? 
(a) p H 1 > pH 2 > pH 3 > pH4 
(b) p H 1 > pH 2 ? pH 3 > pH4 
(c) p H 1 < pH 2 < pH 3 < pH4 
(d)  pH 1 < pH 2 < pH 3 ? pH4 (2005) 
28. Ionic radii are 
(a) inversely proportional to effective nuclear charge 
(b) inversely proportional to square of effective 
nuclear charge 
(c) directly proportional to effective nuclear charge 
(d) directly proportional to square of effective 
nuclear charge. (2004) 
29. The ions O
2–
, F
–
, Na
+
, Mg
2+ 
and Al
3+ 
are isoelectronic. 
Their ionic radii show 
(a) a significant increase from O
2– 
to Al
3+
 
(b) a significant decrease from O
2– 
to Al
3+
 
(c) an increase from O
2– 
to F
– 
and then decrease 
from Na
+ 
to Al
3+
 
(d) a decrease from O
2– 
to F
– 
and then increase 
from Na
+ 
to Al
3+
. (2003) 
30. Which of the following order is wrong? 
(a) NH 3 < PH 3 < AsH 3 – acidic 
(b) Li < Be < B < C – 1
st 
IP 
(c) Al 2O 3 < MgO < Na 2O < K 2O – basic 
(d) L i
+ 
< Na
+ 
< K
+ 
< Cs
+ 
– ionic radius. (2002) 
31. Correct order of 1
st 
ionisation potential among 
following elements Be, B, C, N, O is 
(a) B < Be < C < O < N 
(b) B < Be < C < N < O 
(c) Be < B < C < N < O 
(d) Be < B < C < O < N (2001) 
32. Which of the following elements has the maximum 
electron affinity? 
(a) I (b) Br 
(c) Cl (d) F (1999) 
33. The first ionization potentials (eV) of Be and B 
respectively are 
(a) 8.29, 8.29 (b) 9.32, 9.32 
(c) 8.29, 9.32 (d) 9.32, 8.29 (1998) 
36. Which of the following has the smallest size? 
(a) Al
3+ 
(b) F
–
 
(c) Na
+ 
(d) Mg
2+ 
(1996) 
37. Among the following oxides, the one which is most 
basic is 
(a) ZnO (b) MgO 
(c) Al 2O3 (d) N 2O 5 (1994) 
38. Which of the following has largest size? 
(a) Na (b) Na
+
 
(c)  Na
– 
(d) Can ’t be predicted. 
(1993) 
39. Na
+
, Mg
2+
, Al
3+ 
and Si
4+ 
are isoelectronic. The order 
of their ionic size is 
(a) Na
+ 
> Mg
2+ 
< Al
3+ 
< Si
4+
 
(b) Na
+  
< Mg
2+ 
> Al
3+ 
> Si
4+
 
(c) Na
+  
> Mg
2+ 
> Al
3+ 
> Si
4+
 
(d) Na
+  
< Mg
2+ 
> Al
3+ 
< Si
4+ 
(1993) 
40. In the periodic table from left to right in a period, 
the atomic volume 
(a) decreases 
(b) increases 
(c) remains same 
(d) first decreases then increases. (1993) 
41. Which electronic configuration of an element has 
abnormally high difference between second and 
third ionization energy? 
(a) 1s
2
, 2s
2
, 2p
6
, 3s
1
 
(b) 1s
2
, 2s
2
, 2p
6
, 3s
1
, 3p
1 
(c) 1s
2
, 2s
2
, 2p
6
, 3s
2
, 3p
2
 
(d) 1s
2
, 2s
2
, 2p
6
, 3s
2 
(1993) 
42. One of the characteristic properties of non-metals is 
that they 
(a) are reducing agents 
(b) form basic oxides 
(c) form cations by electron gain 
(d) are electronegative. (1993) 
43. Which one of the following has minimum value of 
cation/anion ratio? 
(a) NaCl (b) KCl 
(c) MgCl2 (d) CaF 2 (1993) 
Page 4


 
 
Nomenclature of Elements with Atomic 
Numbers > 100 
1. Identify the incorrect match.
Name IUPAC Official Name 
(A) Unnilunium (i) Mendelevium
(B) Unniltrium (ii) Lawrencium
(C) Unnilhexium (iii) Seaborgium
(D) Unununnium (iv) Darmstadtium
(a) (A), (i) (b) (B), (ii)
(c) (C), (iii) (d) (D), (iv)
(NEET 2020) 
Electronic Configurations of Elements 
and The Periodic Table 
2. The element Z = 114 has been discovered recently. It
will belong to which of the following family/group
and electronic configuration?
(a) Carbon family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
2
 
(b) Oxygen family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
4
 
(c) Nitrogen family, [Rn] 5f
14 
6d
10 
7s
2 
7p
6
 
(d) Halogen family, [Rn] 5f 
14 
6d
10 
7s
2 
7p
5
 
(NEET 2017) 
3. An atom has electronic configuration
1s
2 
2s
2 
2p
6 
3s
2 
3p
6 
3d
3 
4s
2
, you will place it in
(a) fifth group (b) fifteenth group
(c) second group (d) third group. (2002) 
4. The electronic  configuration  of  an  element  is
1s
2 
2s
2 
2p
6 
3s
2 
3p
3
. What is the atomic number of the
element, which is just below the above element in
the periodic table?
(a) 3 6 (b) 49
(c) 33 (d) 34 (1995) 
5. If the atomic number of an element is 33, it will be
placed in the periodic table in the
(a) first group (b) third group
(c) fifth group (d) seventh group. (1993)
6. The electronic configuration of four elements are
given below. Which elements does not belong to the
same family as others?
(a) [Xe]4f 
14
5d
10
4s
2 
(b) [Kr]4d
10
5s
2
 
(c) [Ne]3s
2
3p
5 
(d) [Ar]3d
10
4s
2 
(1989)
Periodic Trends in Properties of Elements
7. For the second period elements the correct increasing
order of first ionization enthalpy is
(a) Li < Be < B < C < O < N < F < Ne
(b) Li < Be < B < C < N < O < F < Ne
(c) Li < B < Be < C < O < N < F < Ne
(d) Li < B < Be < C < N < O < F < Ne (NEET 2019)
8. Match the oxide given in column I with its property
given in column II.
Column I Column II
(i) Na 2 O A. Neutral
(ii) Al 2O 3 B. Basic
(iii) N 2 O C. Acidic
(iv) Cl 2O7 D. Amphoteric
Which of the following options has all correct pairs?
(a) (i)-B, (ii)-A, (iii)-D, (iv)-C
(b) (i)-C, (ii)-B, (iii)-A, (iv)-D
(c) (i)-A, (ii)-D, (iii)-B, (iv)-C
(d) (i)-B, (ii)-D, (iii)-A, (iv)-C (Odisha NEET 2019)
9. Which of the following oxides is most acidic in nature?
(a) MgO (b) BeO
(c) BaO (d) CaO (NEET 2018) 
10. In which of the following options the order of
arrangement does not agree with the variation of
property indicated against it?
(a) I < Br < Cl < F (increasing electron gain
enthalpy)
(b) Li < Na < K < Rb (increasing metallic radius)
(c) Al
3+ 
< Mg
2+ 
< Na
+ 
< F
– 
(increasing ionic size)
(d) B < C < N < O (increasing first ionisation
enthalpy) (NEET-I 2016) 
3.4 
3.5 
3.7 
(g) 
( g 
2 
( g ) ( g ) 
Classification of Elements and Periodicity in Properties 17 
11. The formation of the oxide ion, O
2– 
from oxygen 
atom requires first an exothermic and then an 
endothermic step as shown below : 
O
( g ) 
? e 
? 
? O
? 
)
; ? 
f 
H?? ? 141 kJ mol 
?1
 
16. What is the value of electron gain enthalpy of Na
+ 
if 
IE 1 of Na = 5.1 eV? 
(a) –5.1 eV (b) –10.2 eV 
(c) +2.55 eV (d) +10.2 eV(Mains 2011) 
O
?
 ? e 
?
 ? O
2 ?
 ; ??
?
f 
H?? ? 780 kJ mol 
? 1
 
17. Which of the following oxides is amphoteric? 
(a) SnO2 (b) CaO 
Thus, process of formation of O
2–  
in gas phase is 
unfavourable even though O
2–  
is isoelectronic with 
(c) SiO2 (d) CO2 (Mains 2011) 
neon. It is due to the fact that, 
(a) O
– 
ion has comparatively smaller size than 
oxygen atom 
(b) oxygen is more electronegative 
(c) addition of electron in oxygen results in larger 
size of the ion 
(d) electron repulsion outweighs the stability gained 
by achieving noble gas configuration. (2015) 
12. Which of the following orders of ionic radii is 
correctly represented? 
(a)  H
–  
> H
+ 
> H (b) Na
+ 
> F
– 
> O
2– 
(c)  F
–  
> O
2– 
> Na
+ 
(d) Al
3+ 
> Mg
2+ 
> N
3–
 
(2014) 
13. Which one of the following arrangements represents 
the correct order of least negative to most negative 
electron gain enthalpy for C, Ca, Al, F and O? 
(a) Al < Ca < O < C < F 
(b) Al < O < C < Ca < F 
(c) C < F < O < Al < Ca 
(d) Ca < Al < C < O < F (Karnataka NEET 2013) 
14. In which of the following arrangements the given 
sequence is not strictly according to the property 
indicated against it? 
(a) HF < HCl < HBr < HI : increasing acidic strength 
(b) H O < H S < H Se < H Te : increasing p K values 
18. The correct order of the decreasing ionic radii 
among the following isoelectronic species is 
(a) Ca
2+ 
> K
+ 
> S
2– 
> Cl
–
 
(b) Cl
– 
> S
2– 
> Ca
2+ 
> K
+
 
(c) S
2– 
> Cl
– 
> K
+ 
> Ca
2+
 
(d)  K
+ 
> Ca
2+ 
> Cl
– 
> S
2– 
(2010) 
19. Which of the following represents the correct order 
of increasing electron gain enthalpy with negative 
sign for the elements O, S, F and Cl? 
(a) Cl < F < O < S (b) O < S < F < Cl 
(c) F < S < O < Cl (d) S < O < Cl < F 
(2010, 2005) 
20. Among the elements Ca, Mg, P and Cl, the order of 
increasing atomic radii is 
(a) Mg < Ca < Cl < P (b) Cl < P < Mg < Ca 
(c) P < Cl < Ca < Mg (d) Ca < Mg < P < Cl 
(Mains 2010) 
21. Among the following which one has the highest 
cation to anion size ratio? 
(a) CsI (b) CsF 
(c) LiF (d) NaF (Mains 2010) 
22. Amongst the elements with following electronic 
configurations, which one of them may have the 
highest ionisation energy? 
(a)  Ne [3s
2 
3p
2
] (b) Ar [3d
10 
4s
2 
4p
3
] 
2 2 2 2 
a
 (c)  Ne [3s
2 
3p
1
] (d)  Ne [3s
2 
3p
3
] (2009) 
(c) NH 3 < PH 3 < AsH 3 < SbH 3 : increasing acidic 
character 
(d) CO 2 < SiO 2 < SnO 2 < PbO 2 : increasing oxidising 
power (Mains 2012) 
15. Identify the wrong statement in the following. 
(a) Amongst isoelectronic species, smaller the 
positive charge on the cation, smaller is the 
ionic radius. 
(b) Amongst isoelectronic species, greater the 
negative charge on the anion, larger is the ionic 
radius. 
(c) Atomic radius of the elements increases as one 
moves down the first group of the periodic table. 
(d) Atomic radius of the elements decreases as one 
moves across from left to right in the 2
nd 
period 
of the periodic table. (2012) 
23. Identify the correct order of the size of the following. 
(a) Ca
2+ 
< K
+ 
< Ar < Cl
– 
< S
2–
 
(b) Ar < Ca
2+ 
< K
+ 
< Cl
– 
< S
2–
 
(c) Ca
2+ 
< Ar < K
+ 
< Cl
– 
< S
2–
 
(d)  Ca
2+ 
< K
+ 
< Ar < S
2– 
< Cl
– 
(2007) 
24. With which of the following electronic configuration 
an atom has the lowest ionisation enthalpy? 
(a)  1s
2 
2s
2 
2p
3 
(b) 1s
2 
2s
2 
2p
5 
3s
1
 
(c)  1s
2 
2s
2 
2p
6 
(d)  1s
2 
2s
2 
2p
5 
(2007) 
25. Which one of the following ionic species has the 
greatest proton affinity to form stable compound? 
(a) NH 
– 
(b) F
–
 
(c)  I
– 
(d) HS
– 
(2007) 
18 
26. Which of the following is the most basic oxide? 
(a) SeO2 (b) Al 2O3 
(c) Sb 2O3 (d) Bi 2O3 (2006) 
27. What is the correct relationship between the pH of 
isomolar solutions of sodium oxide, Na 2O (pH 1 ), 
sodium sulphide, Na S (pH ), sodium selenide, 
34. Which one of the following is correct order of the 
size of iodine species? 
(a)  I
+  
> I
– 
> I (b) I
– 
> I > I
+
 
(c)  I > I
– 
> I
+ 
(d)  I > I
+ 
> I
– 
(1997) 
35. Which of the following ions is the largest in size? 
(a) K
+ 
(b) Ca
2+
 
2
 
2
 (c) Cl
– 
(d) S
2– 
(1996) 
Na 2 Se (pH 3) and sodium telluride Na 2Te (pH 4)? 
(a) p H 1 > pH 2 > pH 3 > pH4 
(b) p H 1 > pH 2 ? pH 3 > pH4 
(c) p H 1 < pH 2 < pH 3 < pH4 
(d)  pH 1 < pH 2 < pH 3 ? pH4 (2005) 
28. Ionic radii are 
(a) inversely proportional to effective nuclear charge 
(b) inversely proportional to square of effective 
nuclear charge 
(c) directly proportional to effective nuclear charge 
(d) directly proportional to square of effective 
nuclear charge. (2004) 
29. The ions O
2–
, F
–
, Na
+
, Mg
2+ 
and Al
3+ 
are isoelectronic. 
Their ionic radii show 
(a) a significant increase from O
2– 
to Al
3+
 
(b) a significant decrease from O
2– 
to Al
3+
 
(c) an increase from O
2– 
to F
– 
and then decrease 
from Na
+ 
to Al
3+
 
(d) a decrease from O
2– 
to F
– 
and then increase 
from Na
+ 
to Al
3+
. (2003) 
30. Which of the following order is wrong? 
(a) NH 3 < PH 3 < AsH 3 – acidic 
(b) Li < Be < B < C – 1
st 
IP 
(c) Al 2O 3 < MgO < Na 2O < K 2O – basic 
(d) L i
+ 
< Na
+ 
< K
+ 
< Cs
+ 
– ionic radius. (2002) 
31. Correct order of 1
st 
ionisation potential among 
following elements Be, B, C, N, O is 
(a) B < Be < C < O < N 
(b) B < Be < C < N < O 
(c) Be < B < C < N < O 
(d) Be < B < C < O < N (2001) 
32. Which of the following elements has the maximum 
electron affinity? 
(a) I (b) Br 
(c) Cl (d) F (1999) 
33. The first ionization potentials (eV) of Be and B 
respectively are 
(a) 8.29, 8.29 (b) 9.32, 9.32 
(c) 8.29, 9.32 (d) 9.32, 8.29 (1998) 
36. Which of the following has the smallest size? 
(a) Al
3+ 
(b) F
–
 
(c) Na
+ 
(d) Mg
2+ 
(1996) 
37. Among the following oxides, the one which is most 
basic is 
(a) ZnO (b) MgO 
(c) Al 2O3 (d) N 2O 5 (1994) 
38. Which of the following has largest size? 
(a) Na (b) Na
+
 
(c)  Na
– 
(d) Can ’t be predicted. 
(1993) 
39. Na
+
, Mg
2+
, Al
3+ 
and Si
4+ 
are isoelectronic. The order 
of their ionic size is 
(a) Na
+ 
> Mg
2+ 
< Al
3+ 
< Si
4+
 
(b) Na
+  
< Mg
2+ 
> Al
3+ 
> Si
4+
 
(c) Na
+  
> Mg
2+ 
> Al
3+ 
> Si
4+
 
(d) Na
+  
< Mg
2+ 
> Al
3+ 
< Si
4+ 
(1993) 
40. In the periodic table from left to right in a period, 
the atomic volume 
(a) decreases 
(b) increases 
(c) remains same 
(d) first decreases then increases. (1993) 
41. Which electronic configuration of an element has 
abnormally high difference between second and 
third ionization energy? 
(a) 1s
2
, 2s
2
, 2p
6
, 3s
1
 
(b) 1s
2
, 2s
2
, 2p
6
, 3s
1
, 3p
1 
(c) 1s
2
, 2s
2
, 2p
6
, 3s
2
, 3p
2
 
(d) 1s
2
, 2s
2
, 2p
6
, 3s
2 
(1993) 
42. One of the characteristic properties of non-metals is 
that they 
(a) are reducing agents 
(b) form basic oxides 
(c) form cations by electron gain 
(d) are electronegative. (1993) 
43. Which one of the following has minimum value of 
cation/anion ratio? 
(a) NaCl (b) KCl 
(c) MgCl2 (d) CaF 2 (1993) 
Classification of Elements and Periodicity in Properties 
44. Which of the following sets has strongest tendency 
to form anions? 
(a) Ga, Ni, Tl 
(b) Na, Mg, Al 
(c) N, O, F 
(d)  V, Cr, Mn (1993) 
45. Elements of which of the following groups will form 
anions most readily? 
(a) Oxygen family (b)  Nitrogen family 
(c) Halogens (d) Alkali metals (1992) 
19 
46. In the periodic table, with the increase in atomic 
number, the metallic character of an element 
(a) decreases in a period and increases in a group 
(b) increases in a period and decreases in a group 
(c) increases both in a period and the group 
(d) decreases in a period and the group. (1989) 
47. Which of the following atoms will have the smallest 
size? 
(a) Mg (b) Na 
(c) Be (d) Li (1989)