question_answer

Which one of the following statements is correct?

(i) Graphite and diamond are non-conductors of electricity.

(ii) Graphite is lighter than diamond.

(iii) Diamond and graphite burns in oxygen to produce carbon dioxide only.

(iv) Diamonds can be made artificially by subjecting pure carbon to very low pressure and temperature.

A) Only (i)

B) Only (ii) and (iv)

C) Only (ii) and (iii)

D) All (i), (ii), (iii) and (iv)

E) None of these