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

F e C l_{3} a n d C u C l_{2}

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V O C l_{2} a n d C u C l_{2}

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V O C l_{2} a n d F e C l_{2}

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F e C l_{3} a n d M n C l_{2}

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Solution

The correct option is A $V O C l_{2} a n d C u C l_{2}$
$V O C l_{2}$ :The oxidation number of V is +4.
V(Z=23): $3 d^{3} 4 s^{2} \to V^{4 +} = 3 d^{1}$ .
One unpaired electron is present
$C u C l_{2}$ : The oxidation number of Cu is $+ 2$

Cu(Z=29): $3 d^{10} 4 s^{1} \to C u^{2 +} = 3 d^{9}$
One unpaired electron is present. The metal ion salts having similar number of unpaired electrons in d-orbitals show similar color in aqueous medium.
Hence option B is correct.

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