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: (d) A colourless and odourless gas is evolved.

A colourless and odourless gas is produced with bubbles when diluting hydrochloric acid is introduced to the granulated zinc placed in the test tube.

It is possible to write the chemical reaction as

Zn + 2HCl → ZnCl2 + H2

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