Which of the following statements regarding copper salts is not true?
Copper $(I)$ disproportionates to copper and copper $(II)$ ion in aqueous solution
Copper $(I)$ can be stablised by the formation of insoluble complex compounds such as $CuCl_2^-$ and $Cu(CN)_2^-$
Copper $(II)$ oxide is red powder
None of these
Which one of the following is paramagnetic
Which of the following ions is coloured
The compound which does not show paramagnetism is :-
The oxoanion in which the oxidation state of the central atom is same as its group number in the periodic table is