Question

when dilute hydrochloric acid is added to zinc pieces​

Answer 1

this is your answer

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Answer 2

Answer: Small bubbles of hydrogen gas appear on the surface of zinc pieces

Explanation: Zn+2HCl(dil)arrow ZnCl_2+H_2Zn+2HCl(dil)arrowZnCl

2

+H

2

This is a single displacement reaction. Zinc being more reactive than hydrogen displaces hydrogen from its solution and forms zinc chloride which is white in color and liberates hydrogen gas which is a odorless gas.

Here zinc gets oxidized to Zn^{2+}Zn

2+

and H^+H

+

in HClHCl gets reduced to form hydrogen gas.

Hope it helps you......