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Question

Which among the following indicates the presence of hydrogen gas?
 
  1. Purple flame
  2. Pop sound
  3. Explosion
  4. Yellow flame


Solution

The correct option is B 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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