While working in a chemistry laboratory, a student took some zinc granules in a test-tube and added a liquid X to it. A gas Y was produced. When a burning matchstick was brought near the mouth of the test-tube, the gas Y burns with a 'pop' sound, making a little explosion.
(a) What could the liquid X be?
(b) Name the gas Y.
(c) State two properties of gas Y.

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Solution

(a) When student adds liquid X in zinc granules, a gas Y is produced with a pop sound, which means that gas Y will be hydrogen.
So, liquid X must be a hydrogen-containing compound, it can be hydrochloric acid.

$Zn + 2 HCl \to {ZnCl}_{2} + H_{2}$

(b) Gas Y will be hydrogen.

(c) Properties of hydrogen gas:
(i) It easily reacts with oxygen to form water.
(ii) It is used as an energy medium in lot of combustion reactions.
(iii) It is used as rotor coolant in electrical generators.

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