d and f Block Elements — JEE Main · 2026 · 06 Apr 2026 · Shift 1 Question with Solution

The correct statements among the following are :
A. Basic vanadium oxide is used in the manufacture of

H_{2} SO_{4}

.
B. The spin-only magnetic moment value of the transition metal halide employed in Ziegler-Natta polymerization is 2.84 BM .
C. The p-block metal compound employed in Ziegler-Natta polymerization has the metal in +3 oxidation state.
D. The number of electrons present in the outer most ' d ' orbital of metal halide employed in Wacker process is 8.
Choose the correct answer from the options given below :

(A)A and B only
(B)A, C and D only
(C)C and D only✓ Correct
(D)B, C and D only

Answer: (C)

Solution

Statement A is wrong:

V_{2} O_{5}

, the catalyst in the contact process for

H_{2} S O_{4}

, is acidic (amphoteric), not basic. In the Ziegler-Natta system the transition-metal halide is

TiC l_{4}

;

T i^{4 +}

3 d^{0}

, so its spin-only moment is

0 BM

, not

2.84 BM

, so statement B is wrong. The

p

-block component is

Al (C_{2} H_{5})_{3}

, in which aluminium is in the

+ 3

state, so statement C is correct. The Wacker process uses

PdC l_{2}

;

P d^{2 +}

4 d^{8}

, giving eight electrons in the

d

sub-shell, so statement D is correct.

Only statements C and D are correct.

JEE Main · 2026 · 06 Apr 2026 · Shift 1 · Single correct option

JEE Main · 2026 · 06 Apr 2026 · Shift 1 · d and f Block Elements

Solution

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