Question

Which among the following are double displacement reactions ? 

1) Pb + CuCl₂ → PbCl₂ + Cu 

2) Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl 

3) C + O₂ = CO₂

4) CH₄ + 2O₂ → CO₂ + 2H₂O 

A) 1, 2 

B) 2 

C) 1, 4 

D) 2, 4

Answer 1

Correct option is B) 2