(a) A soluble chloride X reacted with a liquid Y on heating, to give gas Z which turned moist blue litmus paper red and fumed in moist air.

(i) Identity Y and Z 

(ii) Give one chemical test to confirm that X is a chloride

 

(b)(i) State one laboratory use of calcium chloride.

(ii) Name one laboratory technique suitable for separating a mixture of iron filings and ammonium chloride without applying heat.

(iii) State the action of solutions of the following salts on litmus respectively: K\(_2\)CO\(_3\);  NaNO\(_3\), AICl\(_3\), (NH\(_4\))\(_2\)SO\(_4\).