Name the acid used for the preparation of hydrogen chloride gas in the laboratory. Why is this particular acid preferred to other acids?

Explanation

Conc.sulphuric acid is used for preparation of hydrogen chloride gas in laboratory. This is preferred over other acids because of the following reasons :
(a) It has low volatility than HCl gas (so that the produced HCl gas is collected easily).
(b) It has dehydrating properties, so the HCI gas produced can be effectively dehydrated to remove traces of water.