Question

Define:
combination reaction
decomposition reaction
double displacement reaction
​

Answer 1

COMBINATION REACTION

= When two or more substances combine to form a single product , is called combination reaction .

DECOMPOSITION REACTION

= In a decomposition reaction , a single substance decomposes to give two or more substances .

DOUBLE DISPLACEMENT REACTION

= Any reaction in which there is exchange of ions is called double displacement reaction .

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Answer 2

Combination reaction

A reaction in which two or more substances combine to form a single substance is called combination reaction.

C + O₂ ➝ CO₂

Decomposition reaction

It is the breaking up of a compound either into elements or simpler compounds, such that these products on decomposition do not recombine to form the original compound. It may occur in the presence of heat or light, electric current, etc.

2HgO ➝ 2Hg + O₂

Double displacement reaction

It is a chemical change, in which a more reactive element displaces a less active element from its salt solution.

CuSO₄ + Zn ➝ ZnSO₄ + Cu

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