Question

explain why cuso4is blue while znso4is colourless?

Answer 1

copper sulphate the charge on copper is +2 which means that it's electronic configuration is 3d^9 that implies that it has an unpaired electron so energy from external source easily can exicte the electron to high energy level as the electron is not stable there, so it will tend to come to a low energy level emitting energy in the form of light..nd all the colours r absorbed by the molecule only blue is not absorbed so we see copper sulphate crystals as blue in colour..

Coming to zinc sulphate zinc has +2 charge which implies it's electronic configuration is 3d^10 i.e it has no unpaired electrons so energy is not able to exicte the electrons.. that's why it doesn't decipate an colour