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(A) double displacement reaction is a chemical reaction where two reactant ionic compounds exchange ions to form two new products.Analysis of the give

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$(ii)$ only

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(A) double displacement reaction is a chemical reaction where two reactant ionic compounds exchange ions to form two new products.Analysis of the given reactions:$(i)$ $Pb + CuCl_2 \longrightarrow PbCl_2 + Cu$: This is a displacement reaction where $Pb$ displaces $Cu$.$(ii)$ $Na_2SO_4 + BaCl_2 \longrightarrow BaSO_4 + 2NaCl$: This is a double displacement reaction where $Na^+$ and $Ba^{2+}$ ions exchange places.$(iii)$ $C + O_2 \longrightarrow CO_2$: This is a combination reaction.$(iv)$ $CH_4 + 2O_2 \longrightarrow CO_2 + 2H_2O$: This is a combustion reaction.Therefore,only reaction $(ii)$ is a double displacement reaction.

Which among the following is(are) double displacement reaction$(s)$?
$(i)$ $Pb + CuCl_2 \longrightarrow PbCl_2 + Cu$
$(ii)$ $Na_2SO_4 + BaCl_2 \longrightarrow BaSO_4 + 2NaCl$
$(iii)$ $C + O_2 \longrightarrow CO_2$
$(iv)$ $CH_4 + 2O_2 \longrightarrow CO_2 + 2H_2O$

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Which among the following is(are) double displacement reaction$(s)$?$(i)$ $Pb + CuCl_2 \longrightarrow PbCl_2 + Cu$$(ii)$ $Na_2SO_4 + BaCl_2 \longrightarrow BaSO_4 + 2NaCl$$(iii)$ $C + O_2 \longrightarrow CO_2$$(iv)$ $CH_4 + 2O_2 \longrightarrow CO_2 + 2H_2O$