Given below are two statements : Statement I : The number of pairs among $[\mathrm{Ti}^{4+}, \mathrm{V}^{2+}]$, $[\mathrm{V}^{2+}, \mathrm{Mn}^{2+}]$, $[\mathrm{Mn}^{2+}, \mathrm{Fe}^{3+}]$ and $[\mathrm{V}^{2+}, \mathrm{Cr}^{2+}]$ in which both ions are coloured is 3. Statement II : The number pairs among [$\mathrm{La}^{3+}$, $\mathrm{Yb}^{2+}$], $[\mathrm{Lu}^{3+}, \mathrm{Ce}^{4+}]$ and $[\mathrm{Ac}^{3+}, \mathrm{Lr}^{3+}]$ ions in which both are diamagnetic is 3. In the light of the above statements, choose the correct answer from the option given below :

(A) Both Statement I and Statement II are correct

(B) Both Statement I and Statement II are incorrect

(C) Statement I is correct but Statement II are incorrect

(D) Statement I is incorrect but Statement II are correct

d and f Block Elements — JEE Main · 2026 · 08 Apr 2026 · Shift 2 Question with Solution

Given below are two statements :

Statement I : The number of pairs among

[Ti^{4 +}, V^{2 +}]

[V^{2 +}, Mn^{2 +}]

[Mn^{2 +}, Fe^{3 +}]

and

[V^{2 +}, Cr^{2 +}]

in which both ions are coloured is 3.

Statement II : The number pairs among [

La^{3 +}

Yb^{2 +}

[Lu^{3 +}, Ce^{4 +}]

and

[Ac^{3 +}, Lr^{3 +}]

ions in which both are diamagnetic is 3.

In the light of the above statements, choose the correct answer from the option given below :

Answer: (A)

d^{0}

ion such as

T i^{4 +}

is colourless, whereas ions with a partly filled

d

subshell are coloured through

d - d

transitions.

V^{2 +} (d^{3})

M n^{2 +} (d^{5})

F e^{3 +} (d^{5})

and

C r^{2 +} (d^{4})

are all coloured, while

T i^{4 +} (d^{0})

is not, so three of the four pairs \u2013

[V^{2 +}, M n^{2 +}]

[M n^{2 +}, F e^{3 +}]

and

[V^{2 +}, C r^{2 +}]

\u2013 have both ions coloured, making the first statement correct. In the second set

L a^{3 +}

C e^{4 +}

and

A c^{3 +}

are

f^{0}

while

Y b^{2 +}

L u^{3 +}

and

L r^{3 +}

are

f^{14}

; every one of these ions has an empty or completely filled

f

subshell, so all three pairs are diamagnetic and the second statement is also correct. Both statements are correct.

JEE Main · 2026 · 08 Apr 2026 · Shift 2 · Single correct option