write the test for hydrogen gas
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if hydrogen present in test tube , a lighted splint held near its mouth ignites with a squeaky pop
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test for hydrogen (H2) gas can be performed by bringing a burning candle near the source of hydrogen. On doing so, hydrogen gas burns with a squeaky pop sound. Hydrogen gas is recognised by the 'pop' when it burns. The 'pop' is the sound of a small explosion.
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