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Q.

Consider the following states of carbon

I) Coke      II) Charcoal        III) Petrol         IV) Graphite

Which of these are considered as free states of carbon ?

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a

I, II and IV

b

II and III

c

I and II

answer is D.

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Detailed Solution

Petrol is a mixture of hydrocarbons, where as coke, charcoal and graphite is carbon in free state.
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