Chemistry 9701 · AS & A Level · Analytical techniques

Analytical techniques — practice question

A solid, X, was added to an excess of the liquid Y. A colourless gas was evolved and a white precipitate formed. The precipitate was not X. What might X and Y be?

  • AX: $\text{BaCO}_3$, Y: $\text{H}_2\text{O}$
  • BX: $\text{Ca}$, Y: dilute $\text{H}_2\text{SO}_4$
  • CX: $\text{Mg}$, Y: dilute $\text{H}_2\text{SO}_4$
  • DX: $\text{SrCO}_3$, Y: dilute $\text{HCl}$

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