What do you observe when a glowing match stick introduced into the test tube in
which KMnO4 is heated ?
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There will be a "pop" sound when a matchstick flame is brought near a tube containing hydrogen gas.
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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.
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