Compounds OF Copper || Compounds OF Iron

Compounds OF Copper,Compounds Zin and Mercury and their Reactions

"KMnO4 and its Properties, Important Compounds OF Iron and their Properties"

The compound of copper which tuns green on keeping in air is

Which of the following is copper (I) compound ?

The compounds of iron are coloured and paramagnetic. Explain.

Copper (I) compounds are white and diamagnetic while copper(II) compounds are coloured and paramagnetic. Explain.