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Question

When dilute hydrochloric acid is added to zinc pieces taken in a test tube:
  1. No change takes place.
  2. Small bubbles of a gas appear on the surface of zinc pieces.
  3. The colour of the solution turns yellow.
  4. The gas released will give a pop sound with a glowing splinter.


Solution

The correct options are
B Small bubbles of a gas appear on the surface of zinc pieces.
D The gas released will give a pop sound with a glowing splinter.
When dilute hydrochloric acid is added to zinc pieces 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. Hydrogen gas gives a pop sound with glowing splinter. This is a displacement reaction. It occurs as follows:

Zn+2HCl(dil.)ZnCl2+H2Hydrogen gas

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