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When Acid reacts with Metal, Hydrogen gas is evolved.
We can test the presence of this gas by passing it through soapy solution. On passing it through a soapy solution bubbles of hydrogen gas are formed which burst with a pop sound when a burning candle is brought near them. 
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hope that this helps you..... if you like my ans pl. mark as bst :)
thanku so much
we can test this by bringing a burning splinter near it. it willl burn with a pop sound
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