1.

Assertion : Graphite is a good conductor of electricity however diamond belongs to the category of insulators. Reason: Graphite is soft in nature on the other hand diamond is very hard and brittle.

Answer»

Assertion and reason both are correct statement and reason is correct EXPLANATION for assertion. 
Assertion and reason both are correct statements but reason is not correct explanation for assertion. 
Assertion is correct statement but reason is wrong statement. 
Assertion is wrong statement but reason is correct statement. 

Solution :GRAPHITE is a good conductor of electricity because CARBON atom is `sp^2` hybridized. Hence, one electron on each carbon atom is FREE to move about .


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