When dilute hydrochloric acid is added to zinc pieces 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 gets liberated.

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Small bubbles of hydrogen gas appear on the surface of zinc pieces.

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Solution

The correct option is D
Small bubbles of hydrogen gas appear on the surface of zinc pieces.

$Z n + 2 H C l_{(d i l .)} \to Z n C l_{2} + H_{2} H y d r o g e n g a s ↑$
The above reaction is a single displacement reaction. Zinc displaces hydrogen from the acid and hydrogen gas comes out in the form of small bubbles.

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When dilute hydrochloric acid is added to zinc pieces taken in a test tube:

The correct option is D Small bubbles of hydrogen gas appear on the surface of zinc pieces. Zn+2HCl(dil.)→ZnCl2+H2Hydrogen gas↑ The above reaction is a single displacement reaction. Zinc displaces hydrogen from the acid and hydrogen gas comes out in the form of small bubbles.