Question

Formation of coloured solution is possible when metal ion in the compound contains

• A. paired electrons
• B. unpaired electrons
• C. lone pair of electrons
• D. none of these

Answer 1

Answer: (B)

unpaired electrons

Answer 2

Formation of coloured solution is possible when metal ion in the compound contains unpaired electrons, eg, $Cu ^{+}: 3 d^{10} 4 s^{0}$ colourless $Cu ^{2+}: 3 d^{9} 4 s^{0}$ blue