Question

Why does hydrogen gas rise up once it evolves in test tube

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Answer 1

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When hydrogen gas is released in a reaction it will immediately rise up, because hydrogen is less dense than air. ... Write the balanced equation for the reaction between hydrogen gas and oxygen below.

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Answer 2

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When hydrogen gas is released in a reaction it will immediately rise up, because hydrogen is less dense than air. ... The reaction between a tiny amount of hydrogen and oxygen in the air produces a characteristic 'pop' sound and this serves as test for the presence of hydrogen.