Question

why Cu+2 salt are coloured while Zn+2 salta are colourless​

Answer 1

Explanation:

Cu2+ (3d 9 4s 0) has one unpaired electron in d-subshell which absorbs radiation in visible region resulting in d-d transition and hence Cu2+ salts are coloured. ... No radiation is absorbed for d- d transition and hence Zn2+ salts are colourless.

Copper has an unpared electron which acts as a F centre and allows electron transition in visible region importing color while Zn+2 is having no unpaired electrons hence colorless.

Zn2+(3d10) salts have no impaired electrons but Cu2-(3d9) salts have one unpaired electrons. Hence Zn2+ salts are white while Cu2- salts are coloured.

Hope that it will help you

Answer 2

Explanation:

Zn+2 are colour less because absence of

unpaired electrons

Cu+2 salts are coloured presence of

unpaired d-electrons..........