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Question


Which amongst the following can be observed when zinc granules are added to dilute hydrochloric acid taken in a test tube?


Options:
A .   No change takes place
B .   The colour of the solution turns yellow
C .   A pungent smelling gas is liberated
D .   Small bubbles are formed
Answer: Option D
:
D
When zinc granules are added to dilute hydrochloric acid taken in a test tube, the zinc metal displaces the hydrogen from the acid and hydrogen gas comes out in the form of small bubbles. This is a displacement reaction. It occurs as follows:
Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g)Zinc     Hydrochloric     Zinc             Hydrogen                  acid              chloride

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