Multiple choice

Which of the following statements is incorrect about sulphuric acid?

  1. It reacts with Barium chloride and forms white precipitates.

  2. It releases SO2 on heating with copper.

  3. It forms H2 gas on heating with NaCl.

  4. It is used in the extraction of metals.
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C Correct answer
Explanation

Statement 3 is incorrect because hydrogen gas does not evolve on reaction with sulphuric acid. The following reaction takes place on reaction between them: NaCl (s) + H2SO4 (l) -------> HCl (g) + NaHSO4 (s)

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