Give reason for the following:
Hydrogen chloride gas cannot be dried over quick lime.

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Solution

Hydrogen chloride gas cannot be dried over quicklime because $H C l$ undergoes a chemical reaction with quicklime.

As $H C l$ is acidic and $C a O$ is basic. So, they undergo a reaction.

The reaction is: $2 H C l + C a O \to C a C l_{2} + H_{2} O$

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Q. Assertion :Hydrogen chloride gas can be dried over quick lime. Reason: HCl is less reactive and it reacts with calcium oxide to form calcium oxychloride and does not absorb water in the reaction.

Choose the correct answer from the options given below:
(i) Hydrogen chloride gas being highly soluble in water is dried by:
(a) Anhydrous calcium chloride
(b) Phosphorous penta oxide
(c) Quick lime
(d) Concentrated sulphuric acid.

Q. Hydrogen chloride gas, being highly soluble in the water, is dried by:

Hydrogen chloride gas fumes in moist air but hydrogen sulphide gas does not. Give reasons.

Q. Drying agents like calcium oxide and phosphorus pentoxide are not used for drying hydrogen chloride gas. Give reasons for each. [3 marks]

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Neutralisation Reaction

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Give reason for the following: Hydrogen chloride gas cannot be dried over quick lime.

Hydrogen chloride gas cannot be dried over quicklime because HCl undergoes a chemical reaction with quicklime. As HCl is acidic and CaO is basic. So, they undergo a reaction. The reaction is: 2HCl+CaO→CaCl2+H2O

Give reason for the following:
Hydrogen chloride gas cannot be dried over quick lime.

Hydrogen chloride gas cannot be dried over quicklime because $H C l$ undergoes a chemical reaction with quicklime.

As $H C l$ is acidic and $C a O$ is basic. So, they undergo a reaction.

The reaction is: $2 H C l + C a O \to C a C l_{2} + H_{2} O$