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

No change takes place

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The colour of the solution turns yellow

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A pungent smelling gas is liberated

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Small bubbles are formed

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Solution

The correct option is D Small bubbles are formed
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:

$Zn (s) + 2 HCl (aq) \to {ZnCl}_{2} (aq) + H_{2} (g) Zinc Hydrochloric Zinc Hydrogen acid chloride$

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