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(C) double displacement reaction is a chemical reaction where two reactant compounds exchange ions to form two new compounds.$(i)$ $Pb + CuCl_{2} \rig

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$(ii)$ only

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(C) double displacement reaction is a chemical reaction where two reactant compounds exchange ions to form two new compounds.$(i)$ $Pb + CuCl_{2} \rightarrow PbCl_{2} + Cu$ is a displacement reaction where $Pb$ displaces $Cu$.$(ii)$ $Na_{2}SO_{4} + BaCl_{2} \rightarrow BaSO_{4} + 2NaCl$ is a double displacement reaction where $Na^+$ and $Ba^{2+}$ ions exchange places.$(iii)$ $C + O_{2} \rightarrow CO_{2}$ is a combination reaction.$(iv)$ $CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O$ is a combustion reaction.Therefore,only $(ii)$ is a double displacement reaction.

Which among the following is(are) double displacement reaction$(s)$?
$(i)$ $Pb + CuCl_{2} \rightarrow PbCl_{2} + Cu$
$(ii)$ $Na_{2}SO_{4} + BaCl_{2} \rightarrow BaSO_{4} + 2NaCl$
$(iii)$ $C + O_{2} \rightarrow CO_{2}$
$(iv)$ $CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O$

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Which among the following is(are) double displacement reaction$(s)$?$(i)$ $Pb + CuCl_{2} \rightarrow PbCl_{2} + Cu$$(ii)$ $Na_{2}SO_{4} + BaCl_{2} \rightarrow BaSO_{4} + 2NaCl$$(iii)$ $C + O_{2} \rightarrow CO_{2}$$(iv)$ $CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O$