Name the drying agent used in the lab during the preparation of a gas, formed by the reaction of sodium chloride and sulphuric acid?

Concentrated sulphuric acid

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Nitric acid

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Ammonium chloride

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Dilute sulphuric acid

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Solution

The correct option is A
Concentrated sulphuric acid

The gas formed in the lab, by the reaction of sodium chloride and sulphuric acid is hydrogen chloride gas. HCl gas is acidic in nature. The equation of the reaction is given below.

$2 N a C l + H_{2} S O_{4} \to N a_{2} S O_{4} + 2 H C l$

Sulphuric acid is used for drying this gas during its preparation. Sulphuric acid has a great affinity for water. It readily removes elements of water from other compounds, i.e., it acts as a dehydrating agent. It being a hygroscopic substance absorbs water from other substance without dissolving in it. Another reason for sulphuric acid to be used is that since both $H C l$ and $H_{2} S O_{4}$ both are acidic in nature there will be no reaction between them.

Note: Even though CaO is also a dehydrating agent it is basic in nature. Therefore, it will react with the HCl produced instead of dehydrating it. The reaction of calcium oxide and hydrochloric acid is given below.

$C a O + 2 H C l \to C a C l_{2} + H_{2} O$

Therefore it is clear why sulphuric acid is used as a dehydrating agent in this case.

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Similar questions

In the preparation of hydrogen chloride from sodium chloride and sulphuric acid, the sulphuric acid used should be concentrated

(a) Write the equation for:
(i) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
(ii) the preparation of ammonia from ammonium chloride and calcium hydroxide.
(iii) the reaction of hydrogen chloride with ammonia.

Write the equation for:
(a) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
(b) the reaction between hydrogen chloride and ammonia.

A volatile acid X is formed when sodium chloride reacts with concentrated sulphuric acid. Name this volatile acid.

Q. Classify the following substances which are Non electrolytes.

Acetic acid, ammonium chloride, ammonium hydroxide, carbon tetrachloride, dilute hydrochloric acid, sodium acetate, dilute sulphuric acid.

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