Chemistry
Grade-10
Easy
Question
Which among the following is (are) double displacement reaction(s)?
(i) Pb + CuCl2 → PbCl2 + Cu
(ii) Na2SO4+ BaCl2 → BaSO4 + 2NaCl
(iii) C + O2→ CO2
(iv) CH4 + 2O2 → CO2 + 2H2O
- (i) and (iv)
- (ii) only
- (i) and (ii)
- (iii) and (iv)
Hint:
In a double displacement reaction, two compounds react and the cations and anions of the two reactants swap positions to generate two new compounds or products.
The correct answer is: (ii) only
Only (ii) is double displacement reaction.
- Na2SO4 + BaCl2
BaSO4 + 2NaCl is double displacement reaction.
- In this reaction, the sodium and barium of the two reactants switch places, forming two new compounds BaSO4 and NaCl.
BaSO4 + 2NaCl is double displacement reaction. 
