Which of the following allotropes of carbon is isomorphous with crystalline silicon?
A
Coke
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B
Diamond
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C
Graphite
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D
Coal
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Solution
The correct option is C Diamond Diamond is isomorphous with crystalline silicon. In crystallography crystals are described as isomorphous if they are closely similar in shape. Both carbon and silicon belong to same group. The C atom in diamond and Si atom in crystalline silicon is coordinated to 4 other atoms which results in tetrahedral structure which continues over a large range.