JEE Advanced 2012 Chemistry question

With respect to graphite and diamond, which of the statement(s) given below is (are) correct ?

(A)Graphite is harder than diamond.
(B)Graphite has higher electrical conductivity than diamond.Correct
(C)Graphite has higher thermal conductivity than diamond.
(D)Graphite has higher C-C bond order than diamond.Correct

Answer: (B),(D)

Solution

(A) Diamond, a rigid three-dimensional network of carbons, is the hardest natural substance; graphite is soft and slippery because its layers slide. False. (B) In graphite each carbon has one electron in a delocalised π system spreading over the layer, so it conducts electricity; diamond has no free

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Question ID VK-026101