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From the list given below select the cor...

From the list given below select the correct substance which is most suitable to the statements given :
[oxygen, diamond, zinc, graphite, gold]
(a) A metal which is brittle
(b) A non-metal which is a good conductor of electricity.
(c) The hardest naturally occurring substance.
(cl) The most ductile metal.
(e) A gaseous non-metal.

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