State why an aqeous solution of ammonia `[NH_(4)OH]` is used for identifying cations.

Why is an aqueous solution of NH_4Cl acidic ?

When NH_(4)Cl is added to a solution of NH_(4)OH :

State why an aq. solution of NH_(3) i] turns red litmus blue ii] is a weak base and a weak electrolyte.

An inorganic Lewis acid (X) shows the following reactions : (a) It fumes in moist air. (b) The intensity of fumes increase when a rod dippod in NH_(4) OH is brought near it. ( c) To an aqueous solution of (X) , addition of NH_(4)Cl and NH_(4)OH gives a precipitate which dissolves in NaOH solution. (d) An acidic solution of (X) does not give a precipitate with H_(2) S . Identify (X) and gives chemical reactions for (a) to (d) .

An inorganic Lewis acid (X) shows the following reactions : (a) It fumes in moist air. (b) The intensity of fumes increase when a rod dippod in NH_(4) OH is brought near it. ( c) To an aqueous solution of (X) , addition of NH_(4)Cl and NH_(4)OH gives a precipitate which dissolves in NaOH solution. (d) An acidic solution of (X) does not give a precipitate with H_(2) S . Identify (X) and gives chemical reactions for (a) to (d) .

Statement-1 :Addition of NH_(4)OH to an aqueous solution of BaCl_(2) in presence of NH_(4)Cl (excess) precipitates Ba(OH)_(2) . Statement-2: Ba(OH)_(2) is water soluble.

Why excess of NH_(4)OH is used in precipitating the sulphides of group IV cations?

State why concentrated sulphuric acid is not used for drying ammonia gas

State how NH_(40OH is used for identifying i] Fe^(2+) ii] Fe^(3+) iii] Pb^(2+) iv] Zn^(2+) v ] Cu^(2+) cations. Give also a balanced equation in each case for a known example.