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

(iv) CH4 + 2O2  CO2 + 2 H2O​

Answer 1

Answer:

ans B is correct.....................

Answer 2

1)Pb+CuCl2--->Pbcl2 +cu 2)H2+Cl2 --- 2HCL 3)bacl2+k5so4---baso4 +2KCL. Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.