Question

Dilute hydrochloric acid is added to granulated zinc taken in a test tube The following observations are recorded Point out the correct observation
(a) The surface of metal becomes shining
(b) The reaction mixture turns milky
(c) Odour of a pungent smelling gas is recorded
(d) A colourless and odourless gas is evolved

Answer 1

Answer:

(d) A colourless and odourless gas (hydrogen) is evolved

Explanation:

The given example of reaction is a displacement reaction.

When Dil. Hydrochloric Acid is added to Zinc granules, hydrogen gas is evolved and zinc chloride if formed.

The chemical equation representing the above chemical change is as below:

Zn + 2HCl ----------> ZnCl₂ + H₂↑

How to check the presence of Hydrogen gas ?

The presence of hydrogen gas can be checked by bringing a burning matchstick near the mouth of the test-tube.

The matchstick will extinguish and hydrogen gas will burn with a pop sound.

Answer 2

Answer:

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Explanation:

) A colourless and odourless gas is evolved