Assertion : Cuprous ion(Cu^(+)) is colouless whereas cupric ion (Cu^(++)) is blue in the aqueoussolution. Reason :Cuprous ion (Cu^(+))has unpaired electrons while cupric ion (Cu^(++))does not .

Assertion : Cuprous ion(Cu^(+)) is colouless whereas cupric ion (Cu^(+

1.	Assertion : Cuprous ion(Cu^(+)) is colouless whereas cupric ion (Cu^(++)) is blue in the aqueoussolution. Reason :Cuprous ion (Cu^(+))has unpaired electrons while cupric ion (Cu^(++))does not .
Answer» If both the assertion and reason are true andreason is correct explanation of the assertion . If both the assertion and reason are true but reason is not a correct explanation of the assertion . If the assertion is true but the reason is false. If both assertion and reason are false. Solution :Cuprous ions ` (CU^(+))` is colourless because it has no unpaired electrons in the 3d sub-shell as it has ` 3d^(10)` CONFIGURATION . The cupric ION ` (Cu^(++))` has one unpaired electron as it has configuration ` 3d^(9)` . By absorbingthe visible light the unpaired electron can migrate from one set of d-orbitals to another under the applied field of water molecules. Hencecupric ion `(Cu^(++))` in aqueoussolutionshows blue COLOUR.