Question
Classify the following as physical or chemical properties:
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.

Answer

It is chemical property because chemical reaction takes place between zinc and hydrochloric acid with the evolution of hydrogen gas and a compound zinc chloride is formed.
$\text{Zn(s)}\ +\ 2\text{HCl (dill)}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ }\text{ZnCl}_2(\text{aq})\ +\ \text{H}_2(\text{g})$

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