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What do you observe when dil. HCl is add...

What do you observe when dil. HCl is added on Zn pieces taken in a test tube? How would you identify the gas evolved? Write on use of this gas.

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Observation. A colourless gas is evolved with brisk bubbles from the test tube.
When a burning match stick is brought near the gas, then the gas burns with a pop sound.
The gas evolved is `H_(2)` gas.
`H_(2)` gas is used as fuel in the space crafts.
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