Question

Which among the following is (are) double displacement reactions ? [NCERT Exemplar Problems]
(i) Pb + CuCl2 → PbCl2 + Cu
(ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl
(iii) C + O2 → CO2
(iv) CH4 + 2O2 → CO2 + 2H2O
(a) (i) and (iv)
(b) (ii) only
(c) (i) and (ii)
(d) (iii) and (iv)

Answer 1

Answer:

(b) (ii) only

Explanation:

Na2SO4 + BaCl2 → BaSO4 + 2NaCl

This is a double displacement reaction...

Answer 2

Answer:

option b

Explanation:

sodium attracts towards chlorine

barium attracts towards sulphate

therefore double displacement takes place.