CBSE Class 10 Science 2015 Term I Set 2

Question : 4 of 36

Marks: +1, -0

Name the gas which is usually produced when dil. sulphuric acid reacts with a metal. Illustrate it with an example. How will you test the evolution of this gas ?

Solution:

Metals react with dil. sulphuric acid to give metal sulphates and hydrogen gas.
For example,

{\Zn}( {\ s})+ {\H}_2 {\SO}_4( {\aq}) → {\ZnSO}_4( {\aq})+ {{\H}_2 ↑ }↙{\;\text " (Hydrogen gas)"}

Test for hydrogen gas : Take about

5 {\ml}

of dilute sulphuric acid in a test tube and add a few pieces of zinc granules to it. Hydrogen gas is evolved which forms bubbles in the soap solution.
Bring a burning candle near hydrogen gasfilled bubble. It burns with a pop sound.

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