(vii) A chemical reaction takes place when (a) two substance react together to form a new compound (b) a compound breaks down into simple substances (c) both of these (d) none of these
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Answer:
(a) two substance react together to form a new compound
Explanation:
the compound is salt
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The reaction in which a compound breaks down to give two or more simpler substances is called a decomposition reaction.
For example, on passing an electric current through water in which a small amount of sulphuric acid has been added, water decomposes to give hydrogen and oxygen gases.
2H2O → 2H2 + O2
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