NCERT Exemplar Solutions
Class 10 - Science - CHAPTER 1: Chemical Reactions and Equations - Multiple Choice QuestionsQuestion 7
Class 10 - Science - CHAPTER 1: Chemical Reactions and Equations - Multiple Choice Questions
Question. 7
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
(a)
(i) and (iv)
(b)
(ii) only
(c)
(i) and (ii)
(d)
(iii) and (iv)
Detailed Answer with Explanation:
(ii) is precipitation/double displacement; (i) single displacement; (iii) & (iv) are combination/combustion.