Question

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Answer 1

Answer:

CH2CHO +Na= Na2CO3 + H2

the evolved gas hydrogen can be tested if you collect it into a jar . Cautiously take a match before flame on it and take it above the jar. If it sounds like "pop ..pop..pop" and the fire flicks then you can be sure that the evolved gas is hydrogen.

Answer 2

Explanation:

1stanswer shows in picture

2nd answer and vapours are coming out from the experiment burning matchstick near the gas bubbles it can put off with a Pop sound by this we can know that gas is released