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Which pair of compound is expected to show similar colour in aqueous medium

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$Fe {Cl}_{2} and {CuCl}_{2}$

${VOCl}_{2} and {CuCl}_{2}$

${VOCl}_{2} and {FeCl}_{2}$

${FeCl}_{2} and {MnCl}_{2}$

answer is B.

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Detailed Solution

Colour of transition metal ion salt is due to d - d transition of unpaired electrons of d-orbital. Metal ion salt having similar number of unpaired electron in d-orbitals shows similar colour in aqueous medium

In VOCI₂ vanadium is present as V⁴⁺ and in CuCl₂ , copper is present as Cu²⁺

Number of unpaired electrons = 1

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