Q1 of 8 Page 121

Given below are the names of some chemicals.

Sodium chloride, ammonium hydroxide, nitric acid, concentrated sulphuric acid, sodium hydroxide.


a) Select and write down the substances required to prepare hydrogen chloride.


b) Suggest a method to identify hydrogen chloride gas.

a) When sodium chloride is heated with concentrated sulphuric acid then hydrogen chloride gas is produced.

NaCl + H2SO4→ NaHSO4 + HCl


b) Method to identify hydrogen chloride gas are:


•Moist gas turns blue litmus red.


•It has pungent (choking) smell.


•Bring a rod dipped in ammonia near the mouth of gas jar forms white smoke of ammonium chloride.


More from this chapter

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2

CaO is used as the drying agent while preparing ammonia in the laboratory. Can concentrated sulphuric acid be used as the drying agent in the place of CaO. Substantiate your answer.

 3

Write down the property of sulphuric acid made use of, in the following situations?

a) During the preparation of chlorine gas, the gas is passed through concentrated sulphuric acid.


b) Wooden shelves get charred when they happen to come into contact with concentrated sulphuric acid.

 4

Some salts, the chemicals used to identify them and the results of the experiments are arranged in an incorrect way in the table below. Match them and write in the correct order.

 5

Two suggestions were made when there was a leak of ammonia gas.

1. Spray water


2. Spray HCl


Which among this would you choose? Substantiate your answer.