Question

a lighted match stick is brought near the mouth of the test tube containing hydrogen gas​

Answer 1

Answer:

When a matchstick is brought near the mouth of the test tube in which a metal has reacted with sulphuric acid, the matchstick produces a pop-sound nd stops burning. this is due to evolution of hydrogen gas after the reaction. THE POP SOIND MADE IS DUE TO THE EVOLUTION OF HYDROGEN GAS, THEREBY, BURNING OUT THE FLAME

Answer 2

Answer:

it will make a pop sound which is an indication of the presence of hydrogen gas

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