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Is Matter Around Us Pure ? — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure ?2 Marks
Question
Classify the following as physical or chemical properties:
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
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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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