Laboratory Method of Preparation of Hydrochloric Acid

Name the gas evolved when an oxide and concentrated hydrochloric acid are heated.

State one reason why tap water is not used to prepare a solution of silver nitrate in the laboratory.

Fill in the blank:
Aqua-regia is a mixture of ___________ .

Give two tests for hydrochloric acid.

How will you prepare hydrochloric acid in laboratory? OR
Describe briefly the method employed to dissolve hydrogen chloride gas in water as it is prepared. What is the purpose of funnel while preparing hydrochloric acid from HCI gas?

Write the uses of hydrochIoric acid.

Explain, why (or give reasons for)
Hydrochloric acid cannot be concentrated above 22.2% by boiling.

Explain, why (or give reasons for)
Only a very dilute solution of hydrogen chloride in water can be concentrated by boiling the solution while a very concentrated solution would become less concentrated when boiled.