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NCERT Based Test: Periodic Trends in Properties of Elements - NEET MCQ


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50 Questions MCQ Test Chemistry Class 11 - NCERT Based Test: Periodic Trends in Properties of Elements

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NCERT Based Test: Periodic Trends in Properties of Elements - Question 1

What are the two radii shown as 'a' and 'b' in the figure known as?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 1

'a' Represents covalent radius which is the distance between the nuclei of two bonded atoms 'b' represents van der waals'radius which is the distance between nuclei of two closest molecules.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 2

Few values are given in the table in the direction from left to right and top to bottom. Predict the property which could be depicted in the table.

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 2

Atomic radius decreases in a period from left to right increases in a group from top to bottom.

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NCERT Based Test: Periodic Trends in Properties of Elements - Question 3

Which of the following statements regarding the variation of atomic radii in the periodic table is not true?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 3

Size of atoms decreases with increases in atomic number in a period.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 4

Ionic radius in a group while moving down.

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 4

Ionic radius in a group increases from top to bottom since one energy shell is added with each period

NCERT Based Test: Periodic Trends in Properties of Elements - Question 5

Kand Cl- ions are isoelectronic. Which of the statements is not correct?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 5

NCERT Based Test: Periodic Trends in Properties of Elements - Question 6

Which of the following transitions will involve maximum amount of energy?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 6

M2+ → M3+ + e- ; .IE3 > IE2 > IE1

NCERT Based Test: Periodic Trends in Properties of Elements - Question 7

What is the order of successive ionisation enthalpies?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 7

Third ionisation energy is higher than second ionisation energy which is higher than the first ionisation energy.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 8

Ionisation enthalpy of nitrogen is more than oxygen because of

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 8

Ionisation enthalpy of nitrogen is more than oxygen due to extra stability of half filled orbitals.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 9

Which of the following elettients will have highest second ionisation enthalpy?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 9

After losing one electron, the atom will get a stable configuration and its second ionisation energy will be very high. Hence, option (b) is correct.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 10

Which of the following can most easily form unipositive gaseous ion?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 10

Removal of electron from p-orbital is easier than from s-orbital because of less penetrating power of p-orbitals.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 11

Of the metals Be, Mg., Ca and Sr of group 2 in the periodic table, the least ionic chloride will be formed by

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 11

Beryllium halides are covalent in nature. This is due to small size and high charge of Be2+ ion i.e., it has high polarising power. However, the halides of the other alkaline earth metals (fluorides, chlorides, bromides and iodides) are ionic solids.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 12

A sudden large jump between the values of second and third ionization energies of an element would be associated with which ofthe following electronic configuration?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 12

A sudden large jump between the values of 2nd and 3rd ionisation energies of an element indicates, that the element has two electrons in its valence shell. Then, the possible electronic configuration may be 1s2, 2s2, 2p6, 3s2.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 13

Few elements are matched with their successive ionisation energies. Identify the elements.

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 13

X has highest IE1 and IE2 hence, it is a noble gas. Y has low lE1, but very high IE2 hence, it is an alkali metal.
Z has low lE1 than IE2 and IE2 is even lower than IE2 of alkali metal hence, it is an alkaline earth metal.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 14

First and second ionisation enthalpies (in kj/mol) of few elements are given below:

Which of the above elements will form halides with formula MX2?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 14

(ii) is a reactive metal from second group, and (iii) is a reactive non-metal from 17th group.
For second group elements, the diiFerence in  successive IE is less. The compound formed will be MX2.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 15

The electronic states X and Y of an atom are depicted below:
X : 1s2 2s2 2p6 3s1
Y : 1s2 2s2 2p6 3s2 3p6 4s1
Which of the following statements is not correct?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 15

Given X = 1s2 2s2 2p6 3s1
Y = 1s2 2s2 2p6 3s2 3p6 4s1
Less energy is required to remove an electron from X than Y, because the distance between the nucleus and valence shell in Y is greater as compared to X.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 16

Which of the following elements will have highest ionisation energy?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 16

Half-filled orbitals have extra stability hence they have high ionisation energy.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 17

Few values of enthalpies are given below:
O = - 141 kJ mol-1 F = - 328 kJ mol-1
S = - 200 kJ mol-1 Cl = - 349 kJ mol-1
Wliat do these values show?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 17

Negative value of electron gain enthalpy of S is more than that of oxygen and for Cl it is more than that of fluorine.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 18

In the given graph, a periodic property (R) is plotted against atomic numbers (Z) of the elements. Which property is shown in the graph and how is it correlated with reactivity of the elements?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 18

I.E. in a group decreases and reactivity increases.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 19

Which is correct increasing order of their tendency of the given elements to form M3- ion?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 19

On moving down the group, the stability of-3 oxidation state decreases. This is due to the following reasons (i) On descending a group the size of the atom or ion increases. As a result, attraction of the nucleus per newly added electron decreases (ii) A large anion cannot fit easily into lattice ofa small cation, (iii) As the negative charge on the ion increases, it becomes more and more susceptible to polarisation.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 20

Which of the following will have lowest electron affinity?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 20

Electron affinity of noble gases is zero.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 21

Which of the following arrangements represents the correct order of electron gain enthalpy?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 21

Electron gain enthalpy becomes more negative across a period while it becomes less negative in a group.
However, electron gain enthalpy of O or F is less than that of the succeeding element. When electron is added to n = 2, the repulsion is more than when it is added to n = 3 in case of Cl or S.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 22

Why is the electron gain enthalpy of O or F less than that of S or Cl?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 22

There is more repulsion for the incoming electron when the size of atom is smaller.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 23

Which of the foEowing statements regarding an anion is not true?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 23

The effective nuclear charge decreases when an anion is formed due to increase in number of electrons.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 24

Which of the properties of isotopes of an element is different?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 24

Isotopes differ in physical properties.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 25

Given below are the names of few elements based on their position in the periodic table. Identify the element which is not correctly placed.

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 25

Iodine can gain only one electron.
I + e- → I-

NCERT Based Test: Periodic Trends in Properties of Elements - Question 26

Why do noble gases have positive electron gain enthalpy?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 26

Due to stable configuration they do not accept an electron and hence they have positive electron gain enthalpy.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 27

As we move from left to right, the electronegativity increases. An atom which is highly electronegative has

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 27

It is difficult to remove an electron from a highly electronegative element.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 28

Study the given diagram and fill up the blanks with appropriate choice.
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Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 28

Ionisation enthalpy, electron gain enthalpy and electronegativity increases in a period from left to right while atomic radius decreases.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 29

Fill in the blanks with the appropriate option. 
The ability of an atom to attract shared electrons to itself is called (i). It is generally measured on the (ii) scale. An arbitrary value of (iii) is assigned to fluorine (have greatest ability to attract electrons). It generally (iv) across a period and (v) down a group.

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 29

Electronegativity is measured on Pauling scale. Fluorine, the most electronegative element is given the value 4.0. Electronegativity increases from left to right across a period while decreases down a group.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 30

In which of the following, the order is not in accordance with the property mentioned.

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 30

Electronegativity decreases down the group.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 31

Choose the incorrect statement.

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 31

Electronegativity increases across a period.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 32

In the periodic table, the maximum chemical reactivity is at the extreme left (alkali metals) and extreme right (halogens). Which properties of these two groups are responsible for this?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 32

Elements on the left side have lowest ionisation enthalpy due to which they can very easily lose electrons while the elements onthe right can accept electrons easily as they show highest negative electron gain enthalpy.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 33

An element X has atomic number 19. What will be the formula of its oxide?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 33

Element X has atomic number 19. Its valency will be one. Hence, the formula ofits oxide will be X2O.
Z = 19; 1s22s22p63s23p64s1

NCERT Based Test: Periodic Trends in Properties of Elements - Question 34

An element 'P' has atomic number 56. What will be the formula of its halide?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 34

Z = 56; [Xe] 6s2
Formula of halide is PX2.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 35

Predict the formula of stable compound formed by an element with atomic number 114 and fluorine.

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 35

Atomic number 114 will fall into carbon family, hence it will be tetravalent. So, formula with F will be AF4.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 36

Predict the formula of a compound formed by aluminium and sulphur.

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 36

Al - 3e- → Al3+, S + 2e- → S2-
The formula for its sulphide is AI2S3.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 37

There are many elements in the periodic table which exhibit variable valency. This is a particular characteristic of

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 37

Transition elements show variable valency due to the presence of vacant d-orbitals.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 38

Predict the formulae of the binary compounds formed by combination of the following pairs of elements:
(i) Magnesium and nitrogen
(ii) Silicon and oxygen

NCERT Based Test: Periodic Trends in Properties of Elements - Question 39

The first element of the groups 1 and 2 are different from other members of the respective groups. Their behaviour is more similar to the second element of the following groups. What is this relationship known as?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 39

The relation between 1st element of a group and 2nd element of the next group is called diagonal relationship.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 40

The main reason for showing anomalous properties of the first member of a group in s or p-block is

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 40

Due to small size, large charge/radius ratio and high electronegativity, the first elementshows anomalous behaviour.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 41

When we go from left to right in a period,

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 41

The basic nature of the oxides decreases from left to right in a period, e.g., in third period.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 42

Which of the following oxides is neutral in nature?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 42

CO isa neutral oxide. SrO isa basic oxide. AI2O3 is an amphoteric oxide while CO2 is an acidic oxide.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 43

What is the common property of the oxides CO, NO and N2O?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 43

CO, NO and N2O are neutral oxides.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 44

The correct order of acidic character of oxides in third period of periodic table is

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 44

Acidic character of oxides increases as we move from left to right in a period.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 45

Which of the following sets of oxides is amphoteric in nature?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 45

AI2O3, As2O3 and ZnO are amphoteric in nature.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 46

(A), (B) and (C) are elements in the third short period. Oxide of (A) is ionic, that of (B). is amphoteric and of (C) a giant molecule. (A), (B) and (C) have atomic number in the order ;

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 46

A, B and C are magnesium, aluminium and sillicon. Magnesium forms ionic oxide, (MgO) aluminium forms amphoteric oxide, (AI2O3) and silicon forms a giant molecule (SiO2).

NCERT Based Test: Periodic Trends in Properties of Elements - Question 47

What is common between given cations and anions, O2-, F-, Na+, Mg2+, Al3+?

NCERT Based Test: Periodic Trends in Properties of Elements - Question 48

Which of the following is arranged in order of increasing metallic character?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 48

Metallic character increases down a group and decreases along a period as we move from leftto right. Hence, the order of increasing metallic character is :
P < Si < Be < Mg < Na

NCERT Based Test: Periodic Trends in Properties of Elements - Question 49

Which is the most electropositive element?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 49

The element that belongs to group 1 is the most electropositive. Electropositive character increases down the group.

NCERT Based Test: Periodic Trends in Properties of Elements - Question 50

Among the elements with atomic numbers 9, 12, 16 and 36 which is highly electropositive?

Detailed Solution for NCERT Based Test: Periodic Trends in Properties of Elements - Question 50

Z=9; 1s22s22p5
Z= 12; 1s22s22p63s2
Z =16; 1s2 2s2 2p6 3s2 3p4
Z = 36: 1s2s2 2p6 3s2 3p63d10 4s24p6
Electropositivity decreases along the period while it increases going down the group.

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