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JAMB Chemistry 2024 Paper

Question : 6

Total: 138

When Calcium ethynide is decomposed by water, the gas produced is

Solution:

Concept:

Calcium ethynide (calcium carbide) reacts with water to produce a gaseous hydrocarbon.

Explanation:

Calcium ethynide is another name for calcium carbide,

\mathrm{CaC}_2

When water is added, it undergoes hydrolysis immediately.

The reaction is represented as:

\mathrm{CaC}_2 + 2\mathrm{H}_2\mathrm{O} \rightarrow \mathrm{Ca(OH)}_2 + \mathrm{C}_2\mathrm{H}_2

The gas released is ethyne (acetylene),

\mathrm{C}_2\mathrm{H}_2

Therefore, the correct option is C.

Answer:

\mathrm{C}_2\mathrm{H}_2

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