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WAEC Chemistry 2021 Paper

Question : 8

Total: 50

Solution:

Concept:

A precipitate forms when two soluble salts react to produce an insoluble salt.

Explanation:

Mixing

\mathrm{K}_2\mathrm{SO}_4

and

\mathrm{BaCl}_2

produces

\mathrm{BaSO}_4

, which is insoluble in water.

The balanced equation is:

\mathrm{BaCl}_2(aq) + \mathrm{K}_2\mathrm{SO}_4(aq) \rightarrow \mathrm{BaSO}_4(s) + 2\mathrm{KCl}(aq)

Here,

\mathrm{BaSO}_4

appears as a white precipitate.

The other mixtures contain only soluble salts, so no precipitate forms.

Answer:

\mathrm{K}_2\mathrm{SO}_4

and

\mathrm{BaCl}_2

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