Give reasons for the following :

In the fountain experiment to demonstrate the high solubility of HCl gas in water, dry HCl gas is filled in the round bottom flask.

Give reasons for the following :

Iron sheets are cleaned with hydrochloric acid before dipping into molten zinc for galvanizing.

Complete the statements given below using the correct word/s

1. An aqueous solution of HCl gas is named …………… [aqua fortis / muriatic acid / oil of vitriol]
2. The salt obtained when rock salt reacts with conc. H₂SO₄ at temperatures below 200°C is a/an …………… [acid/normal] salt.
3. In the preparation of HCl acid from HCl gas, a funnel arrangement provides …………… [less/more] surface area for absorption of the gas.
4. The ions which impart acidic properties to an aqueous solution of hydrogen chloride are …………… [chloride/hydrogen/hydronium]
5. The indicator which does not change colour on passage of hydrogen chloride gas is …………… [moist blue litmus / phenolphthalein / methyl orange].

Choose from the letters A, B, C, D and E, to match the descriptions 1 to 5 given below.

A : NH₄Cl
B : AgCl
C : PbCl₂
D : FeCl₂
E : Ag(NH₃)₂Cl

1. A soluble salt obtained on reaction of a metallic chloride with liquor ammonia.
2. A salt which is insoluble in dilute nitric acid but soluble in ammonium hydroxide.
3. A salt obtained on reaction of an active metal with hydrogen chloride gas.
4. A salt obtained when a basic gas reacts with hydrogen chloride gas.
5. A salt soluble in hot water but not in cold, obtained on heating an oxidising agent with conc. HCl.