d – and f – Block Elements: JEE Mains Previous Year Questions (2021-2024) | Chemistry for JEE Main & Advanced PDF Download

 Page 1


 
 
  
 
2024 
 
Q1 - 2024 (01 Feb Shift 2) 
The transition metal having highest 3
rd 
ionisation enthalpy is : 
(1) Cr 
(2) Mn 
(3) V 
(4) Fe 
 
Q2 - 2024 (01 Feb Shift 2) 
Given below are two statements : one is labelled as Assertion (A) and the other is labelled 
as Reason (R). 
Assertion (A) : In aqueous solutions Cr
2+
 is reducing while Mn
3+
 is oxidising in nature. 
Reason (R) : Extra stability to half filled electronic configuration is observed than 
incompletely filled electronic configuration. 
In the light of the above statement, choose the most appropriate answer from the options 
given below: 
(1) Both (A) and (R) are true and (R) is the correct explanation of (A) 
(2) Both (A) and (R) are true but (R) is not the correct explanation of (A) 
(3) (A) is false but (R) is true 
(4) (A) is true but (R) is false 
 
Q3 - 2024 (01 Feb Shift 2) 
Which of the following compounds show colour due to d-d transition? 
(1) CuSO
4
. 5H
2
O 
(2) K
2
Cr
2
O
7
 
(3) K
2
CrO
4
 
Page 2


 
 
  
 
2024 
 
Q1 - 2024 (01 Feb Shift 2) 
The transition metal having highest 3
rd 
ionisation enthalpy is : 
(1) Cr 
(2) Mn 
(3) V 
(4) Fe 
 
Q2 - 2024 (01 Feb Shift 2) 
Given below are two statements : one is labelled as Assertion (A) and the other is labelled 
as Reason (R). 
Assertion (A) : In aqueous solutions Cr
2+
 is reducing while Mn
3+
 is oxidising in nature. 
Reason (R) : Extra stability to half filled electronic configuration is observed than 
incompletely filled electronic configuration. 
In the light of the above statement, choose the most appropriate answer from the options 
given below: 
(1) Both (A) and (R) are true and (R) is the correct explanation of (A) 
(2) Both (A) and (R) are true but (R) is not the correct explanation of (A) 
(3) (A) is false but (R) is true 
(4) (A) is true but (R) is false 
 
Q3 - 2024 (01 Feb Shift 2) 
Which of the following compounds show colour due to d-d transition? 
(1) CuSO
4
. 5H
2
O 
(2) K
2
Cr
2
O
7
 
(3) K
2
CrO
4
 
(4) KMnO
4
 
 
Q4 - 2024 (27 Jan Shift 1) 
Given below are two statements: 
Statement (I): The 4f and 5f - series of elements are placed separately in the Periodic 
table to preserve the principle of classification. 
Statement (II): S-block elements can be found in pure form in nature. In the light of 
the above statements, choose the most appropriate answer from the options given below 
: 
(1) Statement I is false but Statement II is true 
(2) Both Statement I and Statement II are true 
(3) Statement I is true but Statement II is false 
(4) Both Statement I and Statement II are false 
 
Q5 - 2024 (27 Jan Shift 1) 
NaClreacts with conc. H
2
SO
4
 and K
2
Cr
2
O
7
 to give reddish fumes (B), which react with 
NaOH to give yellow solution (C). (B) and (C) respectively are ; 
(1) CrO
2
Cl
2
, Na
2
CrO
4
 
(2) Na
2
CrO
4
, CrO
2
Cl
2
 
(3) CrO
2
Cl
2
, KHSO
4
 
(4) CrO
2
Cl
2
, Na
2
Cr
2
O
7
 
 
Q6 - 2024 (27 Jan Shift 2) 
Given below are two statements: 
Statement (I): In the Lanthanoids, the formation of Ce
+4
 is favoured by its noble gas 
configuration. 
Statement (II) : Ce
+4
 is a strong oxidant reverting to the common +3 state. 
In the light of the above statements, choose the most appropriate answer from the 
options given below: 
(1) Statement I is false but Statement II is true 
(2) Both Statement I and Statement II are true 
(3) Statement I is true but Statement II is false 
(4) Both Statement I and Statement II are false 
 
Q7 - 2024 (27 Jan Shift 2) 
Choose the correct option having all the elements with d
10
 electronic configuration from 
the following: 
Page 3


 
 
  
 
2024 
 
Q1 - 2024 (01 Feb Shift 2) 
The transition metal having highest 3
rd 
ionisation enthalpy is : 
(1) Cr 
(2) Mn 
(3) V 
(4) Fe 
 
Q2 - 2024 (01 Feb Shift 2) 
Given below are two statements : one is labelled as Assertion (A) and the other is labelled 
as Reason (R). 
Assertion (A) : In aqueous solutions Cr
2+
 is reducing while Mn
3+
 is oxidising in nature. 
Reason (R) : Extra stability to half filled electronic configuration is observed than 
incompletely filled electronic configuration. 
In the light of the above statement, choose the most appropriate answer from the options 
given below: 
(1) Both (A) and (R) are true and (R) is the correct explanation of (A) 
(2) Both (A) and (R) are true but (R) is not the correct explanation of (A) 
(3) (A) is false but (R) is true 
(4) (A) is true but (R) is false 
 
Q3 - 2024 (01 Feb Shift 2) 
Which of the following compounds show colour due to d-d transition? 
(1) CuSO
4
. 5H
2
O 
(2) K
2
Cr
2
O
7
 
(3) K
2
CrO
4
 
(4) KMnO
4
 
 
Q4 - 2024 (27 Jan Shift 1) 
Given below are two statements: 
Statement (I): The 4f and 5f - series of elements are placed separately in the Periodic 
table to preserve the principle of classification. 
Statement (II): S-block elements can be found in pure form in nature. In the light of 
the above statements, choose the most appropriate answer from the options given below 
: 
(1) Statement I is false but Statement II is true 
(2) Both Statement I and Statement II are true 
(3) Statement I is true but Statement II is false 
(4) Both Statement I and Statement II are false 
 
Q5 - 2024 (27 Jan Shift 1) 
NaClreacts with conc. H
2
SO
4
 and K
2
Cr
2
O
7
 to give reddish fumes (B), which react with 
NaOH to give yellow solution (C). (B) and (C) respectively are ; 
(1) CrO
2
Cl
2
, Na
2
CrO
4
 
(2) Na
2
CrO
4
, CrO
2
Cl
2
 
(3) CrO
2
Cl
2
, KHSO
4
 
(4) CrO
2
Cl
2
, Na
2
Cr
2
O
7
 
 
Q6 - 2024 (27 Jan Shift 2) 
Given below are two statements: 
Statement (I): In the Lanthanoids, the formation of Ce
+4
 is favoured by its noble gas 
configuration. 
Statement (II) : Ce
+4
 is a strong oxidant reverting to the common +3 state. 
In the light of the above statements, choose the most appropriate answer from the 
options given below: 
(1) Statement I is false but Statement II is true 
(2) Both Statement I and Statement II are true 
(3) Statement I is true but Statement II is false 
(4) Both Statement I and Statement II are false 
 
Q7 - 2024 (27 Jan Shift 2) 
Choose the correct option having all the elements with d
10
 electronic configuration from 
the following: 
(1)
27
Co,
28
Ni,
26
Fe,
24
Cr 
(2)
29
Cu,
30
Zn,
48
Cd,
47
Ag 
(3)
46
Pd,
28
Ni,
26
Fe,
2
24
Cr 
(4)
28
Ni,
24
Cr,
26
Fe,
29
Cu 
 
Q8 - 2024 (29 Jan Shift 1) 
In chromyl chloride test for confirmation of Cl
-
ion, a yellow solution is obtained. 
Acidification of the solution and addition of amyl alcohol and 10\%H 2O 2  turns organic 
layer blue indicating formation of chromium pentoxide. The oxidation state of chromium 
in that is 
(1) +6 
(2) +5 
(3) +10 
(4) +3 
 
Q9 - 2024 (29 Jan Shift 1) 
In alkaline medium. MnO
4
-
oxidises I
-
 to 
(1) IO
4
-
 
(2) IO
-
 
(3) I
2
 
(4) IO
3
-
 
 
Q10 - 2024 (29 Jan Shift 2) 
Which of the following acts as a strong reducing agent? (Atomic number : Ce = 58, Eu =
63, Gd = 64, Lu = 71) 
(1) Lu
3+
 
(2) Gd
3+
 
(3) Eu
2+
 
(4) Ce
4+
 
 
Q11 - 2024 (29 Jan Shift 2) 
Which of the following statements are correct about Zn, Cdand Hg ? 
A. They exhibit high enthalpy of atomization as the d-subshell is full. 
B. Zn and Cd do not show variable oxidation state while Hg shows +I and + II. 
C. Compounds of Zn, Cd and Hg are paramagnetic in nature. 
D. Zn, Cd and Hg are called soft metals. 
Page 4


 
 
  
 
2024 
 
Q1 - 2024 (01 Feb Shift 2) 
The transition metal having highest 3
rd 
ionisation enthalpy is : 
(1) Cr 
(2) Mn 
(3) V 
(4) Fe 
 
Q2 - 2024 (01 Feb Shift 2) 
Given below are two statements : one is labelled as Assertion (A) and the other is labelled 
as Reason (R). 
Assertion (A) : In aqueous solutions Cr
2+
 is reducing while Mn
3+
 is oxidising in nature. 
Reason (R) : Extra stability to half filled electronic configuration is observed than 
incompletely filled electronic configuration. 
In the light of the above statement, choose the most appropriate answer from the options 
given below: 
(1) Both (A) and (R) are true and (R) is the correct explanation of (A) 
(2) Both (A) and (R) are true but (R) is not the correct explanation of (A) 
(3) (A) is false but (R) is true 
(4) (A) is true but (R) is false 
 
Q3 - 2024 (01 Feb Shift 2) 
Which of the following compounds show colour due to d-d transition? 
(1) CuSO
4
. 5H
2
O 
(2) K
2
Cr
2
O
7
 
(3) K
2
CrO
4
 
(4) KMnO
4
 
 
Q4 - 2024 (27 Jan Shift 1) 
Given below are two statements: 
Statement (I): The 4f and 5f - series of elements are placed separately in the Periodic 
table to preserve the principle of classification. 
Statement (II): S-block elements can be found in pure form in nature. In the light of 
the above statements, choose the most appropriate answer from the options given below 
: 
(1) Statement I is false but Statement II is true 
(2) Both Statement I and Statement II are true 
(3) Statement I is true but Statement II is false 
(4) Both Statement I and Statement II are false 
 
Q5 - 2024 (27 Jan Shift 1) 
NaClreacts with conc. H
2
SO
4
 and K
2
Cr
2
O
7
 to give reddish fumes (B), which react with 
NaOH to give yellow solution (C). (B) and (C) respectively are ; 
(1) CrO
2
Cl
2
, Na
2
CrO
4
 
(2) Na
2
CrO
4
, CrO
2
Cl
2
 
(3) CrO
2
Cl
2
, KHSO
4
 
(4) CrO
2
Cl
2
, Na
2
Cr
2
O
7
 
 
Q6 - 2024 (27 Jan Shift 2) 
Given below are two statements: 
Statement (I): In the Lanthanoids, the formation of Ce
+4
 is favoured by its noble gas 
configuration. 
Statement (II) : Ce
+4
 is a strong oxidant reverting to the common +3 state. 
In the light of the above statements, choose the most appropriate answer from the 
options given below: 
(1) Statement I is false but Statement II is true 
(2) Both Statement I and Statement II are true 
(3) Statement I is true but Statement II is false 
(4) Both Statement I and Statement II are false 
 
Q7 - 2024 (27 Jan Shift 2) 
Choose the correct option having all the elements with d
10
 electronic configuration from 
the following: 
(1)
27
Co,
28
Ni,
26
Fe,
24
Cr 
(2)
29
Cu,
30
Zn,
48
Cd,
47
Ag 
(3)
46
Pd,
28
Ni,
26
Fe,
2
24
Cr 
(4)
28
Ni,
24
Cr,
26
Fe,
29
Cu 
 
Q8 - 2024 (29 Jan Shift 1) 
In chromyl chloride test for confirmation of Cl
-
ion, a yellow solution is obtained. 
Acidification of the solution and addition of amyl alcohol and 10\%H 2O 2  turns organic 
layer blue indicating formation of chromium pentoxide. The oxidation state of chromium 
in that is 
(1) +6 
(2) +5 
(3) +10 
(4) +3 
 
Q9 - 2024 (29 Jan Shift 1) 
In alkaline medium. MnO
4
-
oxidises I
-
 to 
(1) IO
4
-
 
(2) IO
-
 
(3) I
2
 
(4) IO
3
-
 
 
Q10 - 2024 (29 Jan Shift 2) 
Which of the following acts as a strong reducing agent? (Atomic number : Ce = 58, Eu =
63, Gd = 64, Lu = 71) 
(1) Lu
3+
 
(2) Gd
3+
 
(3) Eu
2+
 
(4) Ce
4+
 
 
Q11 - 2024 (29 Jan Shift 2) 
Which of the following statements are correct about Zn, Cdand Hg ? 
A. They exhibit high enthalpy of atomization as the d-subshell is full. 
B. Zn and Cd do not show variable oxidation state while Hg shows +I and + II. 
C. Compounds of Zn, Cd and Hg are paramagnetic in nature. 
D. Zn, Cd and Hg are called soft metals. 
Choose the most appropriate from the options given below: 
(1) B, D only 
(2) B, C only 
(3) A, D only 
(4) C, D only 
Q12 - 2024 (30 Jan Shift 1) 
Diamagnetic Lanthanoid ions are: 
(1) Nd
3+
andEu
3+
 
(2) La
3+
andCe
4+
 
(3) Nd
3+
andCe
4+
 
(4) Lu
3+
andEu
3+
 
 
Q13 - 2024 (30 Jan Shift 1) 
Match List-I with List-II 
 
Choose the correct answer from the options given below: 
(1) (A)-I, (B)-II, (C)-III, (D)-IV 
(2) (A)-III, (B) - IV, (C) - I, (D)-II 
(3) (A)-IV, (B)-III, (C)-I, (D)-II 
(4) (A)-II, (B)-I, (C)-IV, (D)-III 
 
Q14 - 2024 (30 Jan Shift 2) 
The orange colour of K
2
Cr
2
O
7
 and purple colour of KMnO
4
 is due to 
(1) Charge transfer transition in both. 
(2) ?? ? d transition in KMnO
4
 and charge transfer transitions in K
2
Cr
2
O
7
. 
(3) d ? dtransition in K
2
Cr
2
O
7
 and charge transfer transitions in KMnO
4
. 
(4) ?? ? ?? transition in both. 
 
Page 5


 
 
  
 
2024 
 
Q1 - 2024 (01 Feb Shift 2) 
The transition metal having highest 3
rd 
ionisation enthalpy is : 
(1) Cr 
(2) Mn 
(3) V 
(4) Fe 
 
Q2 - 2024 (01 Feb Shift 2) 
Given below are two statements : one is labelled as Assertion (A) and the other is labelled 
as Reason (R). 
Assertion (A) : In aqueous solutions Cr
2+
 is reducing while Mn
3+
 is oxidising in nature. 
Reason (R) : Extra stability to half filled electronic configuration is observed than 
incompletely filled electronic configuration. 
In the light of the above statement, choose the most appropriate answer from the options 
given below: 
(1) Both (A) and (R) are true and (R) is the correct explanation of (A) 
(2) Both (A) and (R) are true but (R) is not the correct explanation of (A) 
(3) (A) is false but (R) is true 
(4) (A) is true but (R) is false 
 
Q3 - 2024 (01 Feb Shift 2) 
Which of the following compounds show colour due to d-d transition? 
(1) CuSO
4
. 5H
2
O 
(2) K
2
Cr
2
O
7
 
(3) K
2
CrO
4
 
(4) KMnO
4
 
 
Q4 - 2024 (27 Jan Shift 1) 
Given below are two statements: 
Statement (I): The 4f and 5f - series of elements are placed separately in the Periodic 
table to preserve the principle of classification. 
Statement (II): S-block elements can be found in pure form in nature. In the light of 
the above statements, choose the most appropriate answer from the options given below 
: 
(1) Statement I is false but Statement II is true 
(2) Both Statement I and Statement II are true 
(3) Statement I is true but Statement II is false 
(4) Both Statement I and Statement II are false 
 
Q5 - 2024 (27 Jan Shift 1) 
NaClreacts with conc. H
2
SO
4
 and K
2
Cr
2
O
7
 to give reddish fumes (B), which react with 
NaOH to give yellow solution (C). (B) and (C) respectively are ; 
(1) CrO
2
Cl
2
, Na
2
CrO
4
 
(2) Na
2
CrO
4
, CrO
2
Cl
2
 
(3) CrO
2
Cl
2
, KHSO
4
 
(4) CrO
2
Cl
2
, Na
2
Cr
2
O
7
 
 
Q6 - 2024 (27 Jan Shift 2) 
Given below are two statements: 
Statement (I): In the Lanthanoids, the formation of Ce
+4
 is favoured by its noble gas 
configuration. 
Statement (II) : Ce
+4
 is a strong oxidant reverting to the common +3 state. 
In the light of the above statements, choose the most appropriate answer from the 
options given below: 
(1) Statement I is false but Statement II is true 
(2) Both Statement I and Statement II are true 
(3) Statement I is true but Statement II is false 
(4) Both Statement I and Statement II are false 
 
Q7 - 2024 (27 Jan Shift 2) 
Choose the correct option having all the elements with d
10
 electronic configuration from 
the following: 
(1)
27
Co,
28
Ni,
26
Fe,
24
Cr 
(2)
29
Cu,
30
Zn,
48
Cd,
47
Ag 
(3)
46
Pd,
28
Ni,
26
Fe,
2
24
Cr 
(4)
28
Ni,
24
Cr,
26
Fe,
29
Cu 
 
Q8 - 2024 (29 Jan Shift 1) 
In chromyl chloride test for confirmation of Cl
-
ion, a yellow solution is obtained. 
Acidification of the solution and addition of amyl alcohol and 10\%H 2O 2  turns organic 
layer blue indicating formation of chromium pentoxide. The oxidation state of chromium 
in that is 
(1) +6 
(2) +5 
(3) +10 
(4) +3 
 
Q9 - 2024 (29 Jan Shift 1) 
In alkaline medium. MnO
4
-
oxidises I
-
 to 
(1) IO
4
-
 
(2) IO
-
 
(3) I
2
 
(4) IO
3
-
 
 
Q10 - 2024 (29 Jan Shift 2) 
Which of the following acts as a strong reducing agent? (Atomic number : Ce = 58, Eu =
63, Gd = 64, Lu = 71) 
(1) Lu
3+
 
(2) Gd
3+
 
(3) Eu
2+
 
(4) Ce
4+
 
 
Q11 - 2024 (29 Jan Shift 2) 
Which of the following statements are correct about Zn, Cdand Hg ? 
A. They exhibit high enthalpy of atomization as the d-subshell is full. 
B. Zn and Cd do not show variable oxidation state while Hg shows +I and + II. 
C. Compounds of Zn, Cd and Hg are paramagnetic in nature. 
D. Zn, Cd and Hg are called soft metals. 
Choose the most appropriate from the options given below: 
(1) B, D only 
(2) B, C only 
(3) A, D only 
(4) C, D only 
Q12 - 2024 (30 Jan Shift 1) 
Diamagnetic Lanthanoid ions are: 
(1) Nd
3+
andEu
3+
 
(2) La
3+
andCe
4+
 
(3) Nd
3+
andCe
4+
 
(4) Lu
3+
andEu
3+
 
 
Q13 - 2024 (30 Jan Shift 1) 
Match List-I with List-II 
 
Choose the correct answer from the options given below: 
(1) (A)-I, (B)-II, (C)-III, (D)-IV 
(2) (A)-III, (B) - IV, (C) - I, (D)-II 
(3) (A)-IV, (B)-III, (C)-I, (D)-II 
(4) (A)-II, (B)-I, (C)-IV, (D)-III 
 
Q14 - 2024 (30 Jan Shift 2) 
The orange colour of K
2
Cr
2
O
7
 and purple colour of KMnO
4
 is due to 
(1) Charge transfer transition in both. 
(2) ?? ? d transition in KMnO
4
 and charge transfer transitions in K
2
Cr
2
O
7
. 
(3) d ? dtransition in K
2
Cr
2
O
7
 and charge transfer transitions in KMnO
4
. 
(4) ?? ? ?? transition in both. 
 
Q15 - 2024 (30 Jan Shift 2) 
Alkaline oxidative fusion of MnO
2
 gives "A" which on electrolytic oxidation in alkaline 
solution produces B. 
A and B respectively are: 
(1) Mn
2
O
7
 and MnO
4
-
 
(2) MnO 4
2-
 and MnO
4
-
 
(3) Mn 2O 3 and MnO 4
2-
  
(4) MnO4
2-
 and Mn 2O 7 
 
Q16 - 2024 (30 Jan Shift 2) 
A and B formed in the following reactions are: 
CrO
2
Cl
2
+ 4NaOH ? A + 2NaCl + 2H
2
O 
A + 2HCl + 2H
2
O
2
? B + 3H
2
O 
(1) A = Na
2
CrO
4
, B = CrO
5
 
(2) A = Na
2
Cr
2
O
4
, B = CrO
4
 
(3) A = Na
2
Cr
2
O
7
, B = CrO
3
 
(4) A = Na
2
Cr
2
O
7
, B = CrO
5
 
 
Q17 - 2024 (31 Jan Shift 1) 
Identify correct statements from below: 
A. The chromate ion is square planar. 
B. Dichromates are generally prepared from chromates. 
C. The green manganate ion is diamagnetic. 
D. Dark green colouredK
2
MnO
4
 disproportionates in a neutral or acidic medium to give 
permanganate. 
E. With increasing oxidation number of transition metal, ionic character of the oxides 
decreases. 
Choose the correct answer from the options given below: 
(1) B, C, D only 
(2) A, D, E only 
(3) A, B, C only 
(4) B, D, E only 
 
Q18 - 2024 (31 Jan Shift 1) 
The 'Spin only' Magnetic moment for  Ni NH
3
 
6
 
2+
is _____ × 10
-1
BM. 
(given = Atomic number of Ni: 28)