Question

Which among the following is /are double displacement reaction(s)?

(i) Pb + CuCl2 → PbCl2 + Cu

(ii) Na2SO4 + BaCl2  BaSO4 + 2 NaCl

(iii) C + O2  CO2 Which among the following is /are double displacement reaction(s)?

(i) Pb + CuCl2 → PbCl2 + Cu

(ii) Na2SO4 + BaCl2  BaSO4 + 2 NaCl

(iii) C + O2  CO2

(iv) CH4 + 2O2  CO2 + 2 H2O

(a) (i) and (iv) (b) Only (ii) (c) (i) and (ii) (d) (iii) and (iv)

(iv) CH4 + 2O2  CO2 + 2 H2O​

Answer 1

Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.

AB + CD → AD + CB

In all the reactions only Na2SO4 + BaCl2 ------> BaSO4 + 2NaCl is the double displacement reaction.......................