On adding NaOH to ammonium sulphate, a colourless gas with pungent odour is evolved which forms a blue coloured complex whit Cu^(2+) ion. Identify the gas.

On adding NaOH to ammonium sulphate, a colourless gas with pungent odo

1.	On adding NaOH to ammonium sulphate, a colourless gas with pungent odour is evolved which forms a blue coloured complex whit Cu^(2+) ion. Identify the gas.
Answer» Solution :AMMONIUM sulphate reacts with NaOH to EVOLVE `NH_(3)` gas which has pungent smell and FORMS blue coloured complex with `Cu^(2+)` ions as shown below : `underset("Amm. Sulphate")((NH_(4))_(2)SO_(4))+2NaOHtounderset("Ammonia")(2NH_(3))uarr+Na_(2)SO_(4)+2H_(2)O` `underset("Copper (II) ion")(Cu^(2+)(aq.))+4NH_(3)(aq.)toundersetunderset(("Bule coloured complex"))("Tetraamminecopper (II) ion")([Cu(NH_(3))_(4)]^(2+)(aq.))`