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Question
Give one example each of which illustrates the following characteristics of a chemical reaction:
evolution of a gas
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Solution
When Zinc reacts with dil. sulphuric acid. Hydrogen gas is evolved, with an effervescence
\[\ce{\underset{\text{zinc}}{Zn} +\underset{\text{dil.suphuric acid}}{H2SO4} -> \underset{\text{zinc sulphate}}{ZnSO4} + \underset{\text{hydrogen}}{H2}}\]
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