Chemistry 5070 · O Level · Identification of ions and gases

Identification of ions and gases — practice question

The table presents the outcomes of a set of tests on two substances, X and Y. Which row indicates the identities of the ions present in X and Y?

  • A$\text{X: Ca}^{2+}\ \text{and}\ \text{Br}^{-} \quad \text{Y: Na}^{+}\ \text{and}\ \text{NO}_3^{-}$
  • B$\text{X: Ca}^{2+}\ \text{and}\ \text{Cl}^{-} \quad \text{Y: Na}^{+}\ \text{and}\ \text{I}^{-}$
  • C$\text{X: Ca}^{2+}\ \text{and}\ \text{Cl}^{-} \quad \text{Y: Li}^{+}\ \text{and}\ \text{NO}_3^{-}$
  • D$\text{X: Ca}^{2+}\ \text{and}\ \text{Cl}^{-} \quad \text{Y: Na}^{+}\ \text{and}\ \text{NO}_3^{-}$

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