WAEC Chemistry 2014 Theory — Question 18
Question 18 of 38 from the West African Examinations Council (WAEC) Chemistry 2014 Theory paper, with the correct answer and a full explanation.
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2(d). On warming crystals of sodium chlorate(VI) with concentrated tetraoxosulphate(VI) acid, a gas was evolved. (i) List two physical properties of the gas produced; (ii) Write a balanced equation for the reaction.
Model answer
(i) Physical properties of the gas (chlorine): it is denser than air; it turns moist blue litmus paper red (bleaches it). (ii) NaCl+H₂SO₄→NaHSO₄+HCl (or similar equation representing evolution of HCl gas, depending on the exact reactants).
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