(a) Hydrogen chloride solution in water turns blue litmus red and conducts electricity, while in toluene it does not. Explain why?
(b) Correct the following statement: HCl gas is not combustible but it supports combustion.
(c) Which of the following gas gives a white precipitate when reacted with silver nitrate solution acidified with dilute nitric acid?
(i) Ammonia
(ii) Hydrogen chloride
(iii) Hydrogen sulphide
(iv) Sulphur dioxide [3 MARKS]

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Solution

Each Part: 1 Mark

(a) Hydrogen chloride solution in water turns blue litmus red and conducts electricity while in toluene it does not because the solution of hydrogen chloride in toluene is covalent in nature which indicates the absence of 'H' in toluene.
(b) HCI gas is neither combustible nor it supports combustion.
(c) (ii) Hydrogen chloride gas gives a white precipitate when reacted with silver nitrate solution acidified with dilute nitric acid.

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Hydrogen chloride solution in water turns blue litmus red, and conducts electricity, while in toluene does not. Explain why.

Explain why :

(a) anhydrous HCl is a poor conductor while aqueous HCl is an excellent conductor.
(b) when the stopper of a bottle full of hydrogen chloride gas is opened there are fumes in the air.
(c) a solution of hydrogen chloride in water turns blue litmus red and conducts electricity, while a solution of the same gas in toluene :
(i) has no effect on litmus, and
(ii) does not conduct electricity.
(d) thick white fumes are formed when a glass rod dipped in $N H_{4} O H$ is brought near the mouth of a bottle full of HCl gas.
(e) dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the presence of a drop of water.

(f) hydrogen chloride gas is not collected over water.

Explain, why (or give reasons for)
(i) In the laboratory preparation of hydrogen chloride from sodium chloride, the gas can be obtained below 200°C or above. But the lower temperature is preferred.
(ii) Hydrogen chloride is not collected over water.
(iii) Hydrochloric acid cannot be concentrated above 22.2% by boiling.
(iv) HCl gas does not conduct electricity, but hydrochloric acid conducts electricity.
(v) 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.
(vi) When the stopper of a bottle full of HCl gas is opened there are fumes in the air.
(vii) A solution of HCl gas in water turns blue litmus red and conducts electricity, while HCl gas dissolves in toluene and it has no effect on litmus and does not conduct electricity.
(viii) An aqueous solution of chlorine is acidic in nature.

Q. Given below are word equations. Convert them into chemical equations using symbols and valencies. Balance the equations. Use appropriate signs for gases and precipitates in the reaction.
i) Zinc Sulphide