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Question

Which among the following indicates the presence of hydrogen gas?

A
Pop sound
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B
Purple flame
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C
Explosion
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D
Yellow flame
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Solution

The correct option is A Pop sound
In the laboratory preparation of hydrogen, a pop sound indicates the formation of hydrogen gas. Hydrogen is prepared by adding zinc granules to hydrochloric acid. A pop sound is observed when a lighted match stick is bought close to the mouth of the test tube.


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