When hydrogen gas burns in the presence of oxygen,water is formed,and when water is electrolysed,hydrogen and oxygen gases are produced. State the kind of reaction that takes place:
$(a)$ In the first case
$(b)$ In the second case
$(a)$ In the first case
$(b)$ In the second case
(A) Combination reaction: In this reaction,two or more reactants combine to form a single product $(2H_2 + O_2 \rightarrow 2H_2O)$.
$(b)$ Decomposition reaction: In this reaction,a single reactant breaks down into two or more simpler products under the influence of electricity $(2H_2O \xrightarrow{\text{electricity}} 2H_2 + O_2)$.
$(b)$ Decomposition reaction: In this reaction,a single reactant breaks down into two or more simpler products under the influence of electricity $(2H_2O \xrightarrow{\text{electricity}} 2H_2 + O_2)$.
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$(iii)$ Respiration is an exothermic reaction.
$(i)$ All decomposition reactions are endothermic reactions.
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$(iii)$ Respiration is an exothermic reaction.
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$(i)$ Displacement reaction
$(ii)$ Combination reaction
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$(iv)$ Neutralisation reaction
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