Which of the following compounds are expected to show similar colour in aqueous medium? (1) FeCl2 (2) VOCl2 (3) MnCl2 (4) CuCl2

Question

Which of the following compounds are expected to show similar colour in aqueous medium? (1) FeCl2 (2) VOCl2 (3) MnCl2 (4) CuCl2  (A) 1, 2 and 3 are correct (B) 1 and 2 are correct (C) 2 and 4 are correct (D) 1 and 3 are correct

Tardigrade Admin · Accepted Answer

Metal ion salt having similar number of unpaired electrons in d-orbitals show similar colour in aqueous medium. In

V OC l_{2},

vanadium is present in

V^{4 +}

and in

C u C l_{2}

copper is present as

C u^{2 +}

V^{4 +} : 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}, 3 d^{1};

one unpaired

e^{-}

C u^{2 +} : 1 s^{2}, 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9};

one unpaired

e^{-}

Hence,

V OC l_{2}

and

C u C l_{2}

show similar colour.

Q. Which of the following compounds are expected to show similar colour in aqueous medium? (1) FeCl2​ (2) VOCl2​ (3) MnCl2​ (4) CuCl2​

1, 2 and 3 are correct

1 and 2 are correct

2 and 4 are correct

1 and 3 are correct

Q. Which of the following compounds are expected to show similar colour in aqueous medium? (1) $F e C l_{2}$ (2) $V OC l_{2}$ (3) $M n C l_{2}$ (4) $C u C l_{2}$