Question

3. How will you test for the gas which is liberated when hydrochloric acid reacts with an active

metal?

Answer 1

by passing the evoloved gas(hydrogen) through soap solution and then bringing the burning candle/splinter near the bubble of gas will burn with a *pop* sound indicating the presence of the hydrogen

Answer 2

Let the active metal be Ca as

Metal + acid = salt + H2

Ca + HCL = CaCl2 + H2

So hydrogen is evolved.

So bring a burning splinter near the mouth of the test tube and it will burn with a pop sound . Which indicates there is hydrogen gas