1.

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?

Answer»

Solution :Usually hydrogen gas is liberated when an acid reacts with a METAL. This is illustrated by taking examples of zinc and iron metals.
`Zn(s)+2HCl(aq) rarr ZnCl_(2) + H_(2)(G)`
`Fe(s) + H_(2)SO_(4)(aq) rarr FeSO_(4)(aq) + H_(2)(g)`
Test for Hydrogen gas
Hydrogen gas burns with a POP sound. It is lighter than air. When hydrogen gas is passed through soap solution, soap bubbles are formed which being lighter than air rise up. The pop sound is due to the combustion of hydrogen producing water.
`2H_(2)+O_(2) rarr 2H_(2)O`


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