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Which of the following pair of ions are coloured? (JEE Mains 23/01/2025, Shift - I, Memory Based )

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Which of the following pair of ions are coloured?

(JEE Mains 23/01/2025, Shift - I, Memory Based )

a

\({\mathrm{Ti}}^{4+},{\mathrm{V}}^{3+}\)

b

\({\mathrm{Cr}}^{2+},{\mathrm{Cu}}^{2+}\)

c

\({\mathrm{Cr}}^{3+},{\mathrm{Ni}}^{2+}\)

d

\({\mathrm{Mn}}^{3+},{\mathrm{Ni}}^{2+}\)

✓ Correct answer: b)

\({\mathrm{Cr}}^{2+},{\mathrm{Cu}}^{2+}\)

Explanation

\({\mathrm{Cr}}^{2+},{\mathrm{Cu}}^{2+},\)both are blue in colour.

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