9. Among the various allotropes of carbon :
(a) coke is the hardest, graphite is the softest
(b) diamond is the hardest, coke is the softest
(c) diamond is the hardest, graphite is the softest
(d) diamond is the hardest, lamp black is the softest
Answer : (c)
Explanation : No answer description available for this question. Let us discuss.
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