A blue colouration is not obtained when

In qualitative analysis, a black precipitate is obtained when H_(2)S is passed through an acidified aqueous solution of a salt . A blue coloured solution is obtained on boiling the preciptate with dilute HNO_(3) . The substance obtained on addition of excess of ammonia solution to this blue solution is -

(A): A blue colour is obtained when a copper wire is immersed in AgNO_3 solution (R) : Silver reduces Cu^(2+) to copper

Blue coloured compound is obtained when :

Account for the following: Blue coloured solutions are obtained when alkali metals are dissolved in liquid ammonia.

When CuSO_4 is mixed with excess of NH_3 , a deep blue coloured solution is obtained.What is the IUPAC name of the compound.

When CuSO_4 is mixed with excess of NH_3 , a deep blue coloured solution is obtained.What do you understand by the term coordination number

When the alkaline earth metals such as Ca,Sr,Ba are dissolved in liquid ammonia, deep blue coloured solution is obtained. What are the important properties of this solution?

A blue colouration (in solution or precipitate) is not obtained when: