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Question

_____ is the deposit formed on the sides of retorts after the destructive distillation of coal.

A
Gas carbon
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B
Soot
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C
Lampblack
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D
Coke
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Solution

The correct option is A Gas carbon
During the destructive distillation of coal, a deposition is formed on the sides and the roof of the retort. This deposit is called gas carbon.
It is very hard and a good conductor of electricity. Hence, it is used in electrodes.

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