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JAMB Chemistry 2012 Paper

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Question : 29

Total: 45

A piece of filter paper moistened with lead (ll) ethanoate solution turns black when the paper is dropped into a gas likely to be

sulphur (VI) oxide
hydrogen chloride
sulphur (VI) oxide
hydrogen sulphide

Solution:

Concept:

Lead(II) ethanoate paper is a specific test for hydrogen sulphide gas.

Explanation:

Hydrogen sulphide,

\mathrm{H_2S}

, reacts with lead(II) ethanoate to form black lead(II) sulphide.

\mathrm{Pb(CH_3COO)_2 + H_2S \rightarrow PbS + 2CH_3COOH}

The black colour of

\mathrm{PbS}

indicates the gas is hydrogen sulphide.

Answer:

D. hydrogen sulphide

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