d- and f- Block Elements — DPP 2

20 NEET questions from d- and f- Block Elements, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

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1
Match the column :
d- and f- Block Elements – NEET-11688
  1. A i-a, ii-b, iii-c, iv-d
  2. B i-c, ii-d, iii-b, iv-a
  3. C i-c, ii-d, iii-a, iv-b
  4. D i-b, ii-c, iii-d, iv-a
Show answer & explanation

Correct answer: B

(i) Ni in the presence of Hydrogen → (c) Vegetable oil to vegetable ghee (Hydrogenation of oil)
(ii) CuCl$_{2}$ → (d) Decon process (Manufacture of Cl$_{2}$)
(iii) V$_{2}$O$_{5}$ → (b) Contact Process (Manufacture of H₂SO₄)
(iv) TiCl$_{4}$ + Al(CH$_{3}$)$_{3}$ → (a) Zieglar-Natta catalyst
2
The general electronic configuration of lanthanoid elements is :
  1. A $[ \mathrm { Xe } ] 4 \mathrm { f } ^ { 0 - 14 } 5 \mathrm {~d} ^ { 0 - 1 } 6 \mathrm {~s} ^ { 2 }$
  2. B $[ \mathrm { Xe } ] 4 \mathrm { f } ^ { 0 - 14 } 5 \mathrm {~d} ^ { 1 - 2 } 6 \mathrm {~s} ^ { 1 }$
  3. C $[ \mathrm { Xe } ] 4 \mathrm { f } ^ { 0 - 14 } 5 \mathrm {~d} ^ { 0 - 1 } 6 \mathrm {~s} ^ { 1 - 2 }$
  4. D None of these
Show answer & explanation

Correct answer: D

General electronic configuration of Lanthanoids are – [(n-2)f$^{1-14}$ (n-1)d$^{0-1}$ns$^{2}$]
3
Disproportion can be shown by
  1. A $\mathrm { MnO } _ { 4 } { } ^ { 2 - }$ in acidic medium
  2. B $\mathrm { Cu } ^ { + }$in aqueous medium
  3. C $\mathrm { Cl } _ { 2 }$ in alkaline medium
  4. D All of these
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Correct answer: D

Disproportion is shown by –
MnO$_{4}$$^{–2}$ in acidic medium
Cu$^{+}$ in aqueous medium
Cl$_{2}$ in alkaline medium
4
Cerium can show the oxidation state of + 4 because
  1. A It resemble alkali metals
  2. B It has very low value of I.E.
  3. C Of its tendency to attain noble gas configuration of xenon
  4. D Of its tendency to attain $4 \mathrm { f } ^ { 7 }$ configuration
Show answer & explanation

Correct answer: C

Ce shows +4 oxidation state due to its tendency to attain noble gas configuration.
5
When lanthanoid element is heated with sulphur then compound obtained is :-
  1. A $\mathrm { LnS } _ { 2 }$
  2. B $\mathrm { Ln } _ { 2 } \mathrm {S} _ { 3 }$
  3. C $\mathrm { Ln } _ { 2 } \mathrm {S}$
  4. D $\mathrm { Ln } _ { 3 } \mathrm {S} _ { 4 }$
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Correct answer: B

Lanthanoid element heated with sulphar then Ln$_{2}$S$_{3}$ is formed.
6
Magnetic moment of $\mathrm { x } ^ { \mathrm { n } + }$ is $\sqrt { 24 }$ B.M. Hence No. of unpaired electron and value of ' n ' respectively. (Atomic number $= 26$ )
  1. A 4,3
  2. B 3,5
  3. C 4,2
  4. D 4,1
Show answer & explanation

Correct answer: C

Atomic number – 26 (Fe)
d- and f- Block Elements – NEET-11611 Xn$^{+}$ ⇒ n = 2
So, magnetic moment $\Rightarrow \sqrt{\mathrm{n}(\mathrm{n}+2)} \Rightarrow \sqrt{24}$
7
Match the column :
d- and f- Block Elements – NEET-11689
  1. A i-a, ii-b, iii-c, iv-d
  2. B i-c, ii-d, iii-b, iv-a
  3. C i-c, ii-d, iii-a, iv-b
  4. D i-b, ii-c, iii-d, iv-a
Show answer & explanation

Correct answer: C

(i) Ce → +4
(ii) Eu → +2
(iii) Promethium is radioactive
(iv) Gd$^{+3}$ :- $_{54}$[Xe]4f$^{7}$
8
Given below are two statements :

Statement-I : All Cu(II) halides are known except the iodide.
Statement-II : Increasing order of oxidising power is $\mathrm { VO } _ { 2 } ^ { + } < \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { 2 - } < \mathrm { MnO } _ { 4 } ^ { - }$
In the light of the above statements, choose the most appropriate answer from the options given below :
  1. A Both Statement-I and II are incorrect.
  2. B Statement-I is incorrect and II is correct.
  3. C Statement-I and II both are correct.
  4. D Statement-I is correct while II is incorrect.
Show answer & explanation

Correct answer: C

Statement-I :- Because Cu+2 oxidises I$^{–}$ to I$_{2}$
2Cu$^{+2}$ + 4I$^{–}$ ⎯→ Cu$_{2}$I$_{2}$(s) + I$_{2}$
Statement-II :- Oxidizing power  positive oxidation state of the central metal.
$\begin{array}{l}\mathrm{VO}_{2}^{+} \rightarrow+3 \\ \mathrm{Cr}_{2} \mathrm{O}_{7}^{-2} \rightarrow+6 \\ \mathrm{MnO}_{4}^{-} \rightarrow+7\end{array}$$_{}$$_{}$
9
Match the column :
d- and f- Block Elements – NEET-11691
  1. A a-p, b-q, c-r, d-s
  2. B a-q, b-r, c-s, d-p
  3. C a-s, b-q, c-r, d-p
  4. D a - q , b - p , c - s , d - r
Show answer & explanation

Correct answer: A

(a) Cu + Ni → (p) Silver UK coins
(b) Ni+Cu+ Zn → (q) German silver
(c) Cu+ Zn+ Sn → (r) Gun metal
(d) Ln(95%)+Fe → (s) Misch metal
10
Which of the following species acts as a reducing agent?
  1. A $\mathrm { Ce } ^ { + 4 }$
  2. B $\mathrm { Lu } ^ { + 3 }$
  3. C $\mathrm { Eu } ^ { + 2 }$
  4. D $\mathrm { Ce } ^ { + 3 }$
Show answer & explanation

Correct answer: C

Eu$^{+2}$ will loose electron hence it acts as a reducing agent.
11
Match the column :
d- and f- Block Elements – NEET-11690
  1. A a-p, b-r, c-s, d-q
  2. B a-q, b-r, s-s, d-p
  3. C a-r, b-s, c-p, d-q
  4. D a-q, b-p, c-s, d-r
Show answer & explanation

Correct answer: A

(a) FeSO$_{4}$.7H₂O → (p) Green vitriol
(b) MgSO$_{4}$.7H₂O → (r) Epsom salt
(c) ZnSO$_{4}$.7H₂O → (s) White vitriol
(d) CuSO$_{4}$.5H₂O → (q) Blue vitriol
12
What is the composition of misch metal alloy?
  1. A Lanthanoid metal (95\%) + Iron (5\%)
  2. B $\mathrm { Cu } ( 69 \% ) + \mathrm { Zn } ( 31 \% )$
  3. C $\mathrm { Al } ( 20 \% ) + \mathrm { Cu } ( 80 \% )$
  4. D $\operatorname { Cr } ( 50 \% ) + \operatorname { Zn } ( 30 \% ) + \mathrm { Cu } ( 20 \% )$
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Correct answer: A

Misch Metal alloy is a mixture of Lanthanoid metal (95%) + Iron (5%).
13
Which of the following 3d series metal has positive value of $\mathrm { E } ^ { \circ } \left( \mathrm { M } ^ { + 2 } / \mathrm { M } \right)$ ?
  1. A Zn
  2. B Cu
  3. C Mn
  4. D Cr
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Correct answer: B

Cu has positive of (M$^{+2}$/M) E° in the 3d series due to high enthalpy of atomization.
14
Given below are two statements :
Statement-I : Ag is a transition element.
Statement-II : Ag atom has completely filled d-orbital ( $4 \mathrm {~d} ^ { 10 }$ ) in it's ground state.
In the light of the above statements, choose the most appropriate answer from the options given below:
  1. A Both Statement-I and II are incorrect.
  2. B Statement-I is correct while II is incorrect.
  3. C Statement-I and II both are correct.
  4. D Statement-I is incorrect and II is correct.
Show answer & explanation

Correct answer: C

Statement-I :- All d block elements except Zn, Cd, Hg & Cn are transition elements.
Statement-II:- Electronic configuration of
Ag :– 36[Kr]4d$^{10}$5s$^{1}$
15
$\mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { 2 - } \underset { \mathrm { Y } } { \stackrel { \mathrm { X } } { \rightleftharpoons } } 2 \mathrm { CrO } _ { 4 } ^ { 2 - } , \mathrm { X }$ and Y are respectively
  1. A $\mathrm { X } = \mathrm { OH } ^ { - } , \mathrm { Y } = \mathrm { H } ^ { + }$
  2. B $\mathrm { X } = \mathrm { H } ^ { + } , \mathrm { Y } = \mathrm { OH } ^ { - }$
  3. C $\mathrm { X } = \mathrm { OH } ^ { - } , \mathrm { Y } = \mathrm { H } _ { 2 } \mathrm { O } _ { 2 }$
  4. D $\mathrm { X } = \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } , \mathrm { Y } = \mathrm { OH } ^ { - }$
Show answer & explanation

Correct answer: A

$\underset{\text { (orange) }}{\mathrm{Cr}_{2} \mathrm{O}_{7}^{-2}} \underset{\mathrm{H}^{+}}{\stackrel{\mathrm{OH}^{-}}{\rightleftharpoons}} \underset{\text { (yellow) }}{2 \mathrm{CrO}_{4}^{-2}}$
16
Given below are two statements :
Statement-I : $\mathrm { Cr } ^ { + 2 }$ act as reducing agent and $\mathrm { Mn } ^ { + 3 }$ act as oxidising agent.
Statement-II : $\mathrm { E } ^ { 0 } \left( \mathrm { M } ^ { + 2 } / \mathrm { M } \right)$ value for all 3d-series element's are negative.
In the light of the above statements, choose the most appropriate answer from the options given below :
  1. A Statement-I is incorrect and II is correct.
  2. B Statement-I and II both are correct.
  3. C Both Statement-I and II are incorrect.
  4. D Statement-I is correct while II is incorrect.
Show answer & explanation

Correct answer: D

Statement-I :-
$\begin{array}{l}\mathrm{E}_{\mathrm{Cr}^{+2} / \mathrm{Cr}^{+3}}^{\mathrm{o}} \rightarrow+0.41 \\ \mathrm{E}_{\mathrm{Mn}^{+3} / \mathrm{Mn}^{+2}}^{\mathrm{o}} \rightarrow+1.57\end{array}$

Statement-II :- Positive only for Cu among 3d elements because hydration energy of Cu$^{+2}$ is not enough to compensate for sublimation energy, IE$_{1}$ and IE$_{2}$ for Cu.
17
To which of the following series the transition element from Z=39 to Z=48 belong :
  1. A 3d series
  2. B 4d series
  3. C 5d series
  4. D 6d series
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Correct answer: B

Elements in the 4d series start from Y(39) to Cd(48).
18
Which of the following ion is diamagnetic and colourless?
  1. A $\mathrm { La } ^ { + 3 }$
  2. B $\mathrm { Lu } ^ { + 3 }$
  3. C $\mathrm { Zn } ^ { + 2 }$
  4. D All of the above
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Correct answer: D

All the options are diamagnetic and colourless.
19
Given below are two statements :
Statement-I : All the transition elements show typical metallic properties such as high tensile strength, ductility but low thermal and electrical conductivity.
Statement-II : Zn, Cd & Hg are very hard and have low volatility.
In the light of the above statements, choose the most appropriate answer from the options given below :
  1. A Statement-I is correct while II is incorrect.
  2. B Both Statement-I and II are incorrect.
  3. C Statement-I and II both are correct.
  4. D Statement-I is incorrect and II is correct.
Show answer & explanation

Correct answer: B

Transition metals other than Zn, Cd & Hg are hard and have high m. p. because of unpaired e$^{–}$ which form metallic bonds.
20
The highest oxidation state shown by actinides is:
  1. A + 6
  2. B + 7
  3. C + 5
  4. D + 4
Show answer & explanation

Correct answer: B

+7 oxidation state is shown by Neptunium and plutonium.

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