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Study the set-up below and answer the questions that follow.

(a) Name a suitable drying agent for gas X.
(b) A sample of gas X was passed through a test tube containing copper (II) sulphate solution.
(i) State what was observed in the test tube.
(ii) Explain the observation in (b)(i) above using an ionic equation.

Answer Text:
a).Anhydrous calcium chloride
b)i).Black precipitates
ii).#Cu^(2+)(aq) + S^(2-)(aq) → CuS_(s)#