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ICSE Class 10 Chemistry Question 8 of 20

Solved 2018 Question Paper ICSE Class 10 Chemistry — Question 5

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5
Question

Question 3(b)

(i) Name the acid used for the preparation of hydrogen chloride gas in the laboratory. Why is this particular acid preferred to other acids?

(ii) Write the balanced chemical equation for the laboratory preparation of hydrogen chloride gas.

Answer

(i) Conc. H2SO4 is used for the preparation of hydrogen chloride gas in the laboratory.

As conc. H2SO4 is non-volatile and has a high boiling point, therefore, it displaces the volatile hydrogen chloride from the salt sodium chloride. Hence, conc. H2SO4 is used as a reactant in the laboratory preparation of HCl from sodium chloride.

(ii) NaCl+H2SO4→<200°CNaHSO4+HCl [g.]\text{NaCl} + \text{H}_2\text{SO}_4 \xrightarrow{\lt 200 \degree\text{C}} \text{NaHSO}_4 + \text{HCl [g.]}