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

  1. (i) and (iv)
  2. (ii) only
  3. (i) and (ii)
  4. (iii) and (iv)

hintHint:

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 rightwards arrow 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. 

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