`FeSO_(4)` solution mixed with `(NH_(4))_(2)SO_(4)` solution in 1 : 1 molar ratio gives the test for `Fe^(2+)` ion but `CuSO_(4)` mixed with aqueous ammonia in 1 : 4 molar ratio does not give the test of `Cu^(2+)` ion. why ?

1 kg of 2m urea solution is mixed with 2 kg of 4m urea solution. The molality of the resulting solution is

(A) : Aqueous solution of Mohr's salt exhibits the test for NH_4^(+), Fe^(2+) and SO_4^(2-) ions. (R ): Mohr's salt is a double salt .

Alum in aqueous solution gives positive test for (A) K^(+) , (B) Al^(3+) , (C) SO_4^(2-)

The complex ion [Cu(NH_(3))_(4)]^(2+) has :

An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCI in cold conditions. B is soluble in boiling water. An aqueous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with dilute H_(2)SO_(4) boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) Concentrated H_(2)SO_(4) is added to the resulting solution (along the walls of the test tube so that the H_(2)SO_(4) forms a separate layer). A brown ring is formed at the junction of the two layers. On treatment with a Kl solution, an aqueous solution of A will give

NH_4^+ ion is an aqueous solution will behave as

Equal volume of 0.1M HCl and 0.2M H_(2)SO_(4) are mixed. What is the molarity of proton in the mixture?

No. of ions produced by dissolving PtCl_(4).2NH_(3) in aqueous media is