A gas was formed when zinc reacted with...

A gas was formed when zinc reacted with dilute hydrochloric acid.
a) A pop sound was heard when a burning match stick introduced at the mouth of the test tube. What is the reason for that?
b) When a balloon was filled with the gas above and released, it moves upwards. What could be the reason for this?

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a) Forming of hydrigen gas
b) Density of hydrogen is lighter than air

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