Match List-I with List-II List-I (Species): (A) \(\mathrm{Cr}^{+2}\) (B) \(\mathrm{Mn}^{+}\) (C) \(\mathrm{Ni}^{+2}\) (D) \(\mathrm{V}^{+}\) List-II (Electronic distribution): (I) \(3 d^{8}\) (II) \(3 \mathrm{~d}^{3} 4 \mathrm{~s}^{1}\) (III) \(3 \mathrm{~d}^{4}\) (IV) \(3 d^{5} 4 s^{1}\) Choose the correct answer from the options given below:

— III — IV — I — II So A-III, B-IV, C-I, D-II.

JEE Main · 2024 · 30 Jan 2024 · Shift 1 · d and f Block Elements

Match List-I with List-II

List-I (Species):
(A)

Cr^{+ 2}

(B)

Mn^{+}

(C)

Ni^{+ 2}

(D)

V^{+}

List-II (Electronic distribution):
(I)

3 d^{8}

(II)

3 d^{3} 4 s^{1}

(III)

3 d^{4}

(IV)

3 d^{5} 4 s^{1}

Choose the correct answer from the options given below:

Answer: A → III, B → IV, C → I, D → II

_{24} Cr : [Ar] 3 d^{5} 4 s^{1} \Rightarrow C r^{2 +} : [Ar] 3 d^{4}

— III

_{25} Mn : [Ar] 3 d^{5} 4 s^{2} \Rightarrow M n^{+} : [Ar] 3 d^{5} 4 s^{1}

— IV

_{28} Ni : [Ar] 3 d^{8} 4 s^{2} \Rightarrow N i^{2 +} : [Ar] 3 d^{8}

— I

_{23} V : [Ar] 3 d^{3} 4 s^{2} \Rightarrow V^{+} : [Ar] 3 d^{3} 4 s^{1}

— II

So A-III, B-IV, C-I, D-II.

JEE Main · 2024 · 30 Jan 2024 · Shift 1 · Match the columns