Question

how will you justify that hydrogen gas is evolved on reaction of metal with water​

Answer 1

Answer:

When metals react with nitric acid hydrogen gas is liberated. Nitric acid is a very strong oxidizing agent. So , it oxidizes the hydrogen gas formed during the reaction to form water and an oxide of nitrogen ( NO,N2O,NO2 etc. ). Magnesium and manganese react with very dilute nitric acid to liberate hydrogen gas.

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Answer 2

Answer:

H2 gas burns with a pop sound

so when we keep a matchstick on top of beaker, it burns with a popping sound.

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