JEE Main · 2021 · Shift-ImediumDNF-017

The set having ions which are coloured and paramagnetic both is:

d & f-Block Elements · Class 12 · JEE Main Previous Year Question

Question

Options

a
$\text{Cu}^{2+},\, \text{Cr}^{3+},\, \text{Sc}^{+}$
✓
b
$\text{Cu}^{2+},\, \text{Zn}^{2+},\, \text{Mn}^{4+}$
c
$\text{Sc}^{3+},\, \text{V}^{5+},\, \text{Ti}^{4+}$
d
$\text{Ni}^{2+},\, \text{Mn}^{7+},\, \text{Hg}^{2+}$

Correct Answera

$\text{Cu}^{2+},\, \text{Cr}^{3+},\, \text{Sc}^{+}$

Detailed Solution

Need: partially filled d orbitals ( $d^1$ – $d^9$ ) for both colour and paramagnetism.

Option (1):

| Ion | Config | Unpaired e⁻ | Coloured | Paramagnetic | |-----|--------|-------------|----------|--------------| | $\text{Cu}^{2+}$ | $3d^9$ | 1 | Yes | Yes ✓ | | $\text{Cr}^{3+}$ | $3d^3$ | 3 | Yes | Yes ✓ | | $\text{Sc}^{+}$ | $3d^1 4s^1$ | 2 | Yes | Yes ✓ |

Other options fail:

$\text{Zn}^{2+}$ ( $3d^{10}$ ): colourless, diamagnetic ✗
$\text{Sc}^{3+}$ , $\text{V}^{5+}$ , $\text{Ti}^{4+}$ : all $d^0$ , colourless, diamagnetic ✗
$\text{Mn}^{7+}$ ( $3d^0$ ), $\text{Hg}^{2+}$ ( $5d^{10}$ ): colourless, diamagnetic ✗

Answer: Option (1)

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