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Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

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When an acid react with a metal, it liberates hydrogen gas. 

For example: 

Zn(s) + 2HCl(aq.) → ZnCl2(aq.) + H2(g) 

To test the presence of H2 gas, bring a burning splinter near the mouth of the test tube where H2 gas is released, the splinter burns with a pop sound.

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Hydrogen gas is usually liberated when an acid reacts with metal .

Eg .  Na (s) +  HCL(aq)  ---->  NaCl (aq) + H(g)

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