NCERT- Exemplar questions - III — task. Science CBSE, Class 10.

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1. Which of the following statements is not correct?

Some metals react with acids to give salt and hydrogen
All metal carbonates react with acid to give a salt, water and carbon dioxide
All metal oxides react with water to give salt and acid
Some non-metal oxides react with water to form an acid

2. Identify the correct representation of reaction occurring during the chloralkali process

\(2NaCl (aq) + 2H_2O (l) \rightarrow 2NaOH (aq) + Cl_2 (g) + H_2 (g) \)
\(2NaCl (aq) + 2H_2O (aq) \rightarrow 2NaOH (aq) + Cl_2 (g) + H_2 (g) \)
\(2NaCl (l) + 2H_2O (l) \rightarrow 2NaOH (l) + Cl_2 (g) + H_2 (g) \)
\(2NaCl (aq) + 2H_2O (l) \rightarrow 2NaOH (aq) + Cl_2 (aq) + H_2 (g) \)

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