1.

A gas is evolved when a piece of zinc metal placed in dilute sulphuric acid (H_(2)SO_(4)) . What is the gas ?

Answer»

Hydrogen
OXYGEN
Water vapour
Sulphur dioxide

Solution :Hydrogen gas is evolved when a piece of zinc METALS is PLACED in dilute sulphuric acid `(H_(2)SO_(4))` . The chemical reaction is
`Zn + H_(2)SO_(4) to ZnSO_(4) + H_(2) uarr`


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