Which of the following are combination reacti | vedclass

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(B) combination reaction is a reaction in which two or more reactants combine to form a single product.$(i) 2 KClO_3 \xrightarrow{	ext{Heat}} 2 KCl +

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$(ii)$ and $(iii)$

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(B) combination reaction is a reaction in which two or more reactants combine to form a single product.$(i) 2 KClO_3 \xrightarrow{	ext{Heat}} 2 KCl + 3 O_2$: This is a decomposition reaction because a single reactant breaks down into simpler products.$(ii) MgO + H_2O \longrightarrow Mg(OH)_2$: This is a combination reaction because two reactants ($MgO$ and $H_2O$) combine to form a single product $(Mg(OH)_2)$.$(iii) 4 Al + 3 O_2 \longrightarrow 2 Al_2O_3$: This is a combination reaction because two reactants ($Al$ and $O_2$) combine to form a single product $(Al_2O_3)$.$(iv) Zn + FeSO_4 \longrightarrow ZnSO_4 + Fe$: This is a displacement reaction because $Zn$ displaces $Fe$ from its salt solution.Therefore, $(ii)$ and $(iii)$ are combination reactions.

Which of the following are combination reactions?
$(i) 2 KClO_3 \xrightarrow{\text{Heat}} 2 KCl + 3 O_2$
$(ii) MgO + H_2O \longrightarrow Mg(OH)_2$
$(iii) 4 Al + 3 O_2 \longrightarrow 2 Al_2O_3$
$(iv) Zn + FeSO_4 \longrightarrow ZnSO_4 + Fe$

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Which of the following are combination reactions?$(i) 2 KClO_3 \xrightarrow{\text{Heat}} 2 KCl + 3 O_2$$(ii) MgO + H_2O \longrightarrow Mg(OH)_2$$(iii) 4 Al + 3 O_2 \longrightarrow 2 Al_2O_3$$(iv) Zn + FeSO_4 \longrightarrow ZnSO_4 + Fe$