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JAMB Chemistry 2018 Paper

Question : 81

Total: 87

_2

_{(g)}

_{2(g)}

_{(g)}

_{(g)}

Solution:

Concept:

Reduction is the gain of hydrogen, gain of electrons, or loss of oxygen.

Explanation:

In the reaction,

\mathrm{H_2S_{(g)} + Cl_{2(g)} \rightarrow 2HCl_{(g)} + S_{(g)}}

, only the reactants can be described as oxidized or reduced.

Chlorine,

\mathrm{Cl_2}

, gains hydrogen atoms to form

\mathrm{HCl}

Gaining hydrogen is reduction.

Therefore,

\mathrm{Cl_2}

is the substance reduced.

Meanwhile, hydrogen is removed from

\mathrm{H_2S}

, so

\mathrm{H_2S}

is oxidized to sulfur.

Answer:

\mathrm{Cl_2}

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