WAEC Chemistry 2021 Theory — Question 13
Question 13 of 31 from the West African Examinations Council (WAEC) Chemistry 2021 Theory paper, with the correct answer and a full explanation.
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2(b). When crystals of sodium chloride are warmed with concentrated tetraoxosulphate (VI) acid, a gas was produced. (i) Name the gas. (ii) State two physical properties of the gas. (iii) Write a balanced chemical equation for the reaction.
Model answer
(i) Hydrogen chloride gas. (ii) Any two: colourless; has a choking/irritating smell; very soluble in water; fumes in moist air. (iii) 2NaCl(s) + H2SO4(aq) → Na2SO4(aq) + 2HCl(g).
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