22. Choose the best answer: NCERT- Exemplar questions - I

5 m.

Choose the best answer:

1. Which of the following is not a physical change?

2. Which among the following is(are) double displacement reaction(s)?

\(Pb\) + \(CuCl_2\) → \(PbCl_2\) + \(Cu\)
\(Na_2SO_4\) + \(BaCl_2\) → \(BaSO_4\) + \(2NaCl\)
\(C\) + \(O_2\) → \(CO_2\)
\(CH_4\) + \(2O_2\) → \(CO_2\) + \(2H_2O\)
\(2H_2S\) + \(3O_2\) → \(2H_2O\) + \(2SO_3\)

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