Question

The aqueous solution of the following salts will be coloured in the case of :

• A. Zn(NO${}_3$)${}_2$
• B. LiNO${}_3$
• C. Co(NO${}_3$)${}_2$
• D. CrCl${}_3$

Answer 1

Answer: (C), (D)

Co(NO${}_3$)${}_2$
CrCl${}_3$

Species with unpaired electron will show colour.
And in $Co(N{O}_3{)}_2$, Co has unpaired electron while in $CrC{l}_3$, Cr has unpaired electron. So, their solution will be coloured.