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  4. When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution, the ratio of volumes of hydrogen evolved is:

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Q. When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution, the ratio of volumes of hydrogen evolved is:

BITSATBITSAT 2013

Solution:

The reactions of zinc with sulphuric acid and excess of sodium hydroxide separately are given below:
$Zn +2 NaOH \rightarrow Na _{2} ZnO _{2}+ H _{2}$
$Zn + H _{2} SO _{4} \rightarrow ZnSO _{4}+ H _{2}$
In both the reactions, $1$ mole of $H _{2}$ is evolved.
Hence, the ratio of volumes of hydrogen evolved is $1: 1$.