Subjective Type

Hydrochloric acid contains (i) hydrogen (ii) chlorine. Prove it. Write equations for the reactions.

Solution

We can prove that hydrochloric acid contains both hydrogen and chlorine by the following experiment.

Take a voltameter used for electrolysis of water fitted with the platinum cathode and a graphite anode. Into the voltameter pour 4 molar HCI and pass direct current.

It is seen that a colorless gas is evolved at the cathode and a greenish gas is evolved at the anode. When a burning splinter is brought near a colorless gas, it bursts into a flame thereby proving that it is hydrogen gas.
When moist starch iodide paper is held in the greenish-yellow gas. it turns blue-black. thereby proving that the gas is chlorine.

$$2HCl \to \underset{\text{Cathode}}{H_2} + \underset{\text{Anode}}{Cl_2}$$

This experiment proves that hydrochloric acid contains both hydrogen and chlorine.

SIMILAR QUESTIONS

p - block Elements

When iron filings are heated in a steam of dry hydrogen chloride, the compound formed is $$FeCl_{x}$$, where 'x' is :

p - block Elements

$$HCl$$ gas can fume in moist air.

p - block Elements

A and B are two gases. A is identified with the glass rod dipped in $$NH_3$$ and $$\mathrm{B}$$ is identified with the glass rod dipped in $$HCl$$. Then A and B are :

p - block Elements

The solution of $$BiCl_{3}$$ in dil. $$HCl$$ when diluted with water, white precipitate is formed which is:

p - block Elements

When three parts of conc. HCl and one part of conc. $$HNO_{3}$$ is mixed, a compound 'X' is formed. The correct option related to 'X' is:

p - block Elements

Write an equation for the reactions of aqueous hydrochloric acid on: zinc carbonate.

p - block Elements

Write an equation for the reactions of aqueous hydrochloric acid on: lead nitrate solution.

p - block Elements

Write an equation for the reactions of aqueous hydrochloric acid on: copper oxide.

p - block Elements

Name black metallic oxide which reacts with hydrochloric acid to give a coloured solution.

p - block Elements

Name the experiment which demonstrates that hydrogen chloride is soluble in water.

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