Question

Compound that is both paramagnetic and coloured is

• A. $K_{2}Cr_{2}O_{7}$
• B. $(NH_{4})_{2}\lbrack TiCl_{6}\rbrack$
• C. $VOSO_{4}$
• D. $K_{3}\lbrack Cu(CN)_{4}\rbrack$

Answer 1

Answer: (C)

$VOSO_{4}$

Answer 2

$K_{2}Cr_{2}O_{7}$ contains $Cr^{6 +}(3d^{0})$ which is diamagnetic but coloured due to charge transfer spectra.

$(NH_{4})_{2}\lbrack TiCl_{6}\rbrack$ contains$Ti^{4 +}(3d^{0})$, which is diamagnetic and colourless

$VOSO_{4}$ contains$V^{4 +}(3d^{1})$ which is paramagnetic and coloured.

$K_{3}\lbrack Cu(CN)_{4}\rbrack$ Contains $Cu^{+}(3d^{10})$ which is diamagnetic and colourless