A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify Y and Z.

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Solution

Y, that is, the hardest naturally occurring substance in the world is diamond.
The substance Z, which is a good conductor of electricity is Graphite.
Both diamond and Graphite come from Carbon, a non-metal which lacks lustre, and also does not conduct electricity.
Carbon and diamond and graphite have different properties due to the crystal structures of each.

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Question 43
A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.

Name the following :

(a) The hardest naturally occurring substance.

(b) A greyish black non-metal that is a good conductor of electricity.

Name

(a) a soft metal.

(b) a metal which is brittle.

(d) a liquid metal.

(e) a metal which is a poor conductor of electricity.

(f) a non-metal which is a good conductor of electricity.

(g) a liquid non-metal.

(h) the hardest naturally occurring substance.

(i) an inert gas.

Match the entries of column I with column II.

Material	Exception
(a) Iodine (Non-metal)	(i) Exists in liquid state
(b) Diamond (Non-metal)	(ii) Conducts electricity
(c) Mercury (Metal)	(iii) Lustrous
(d) Graphite (Non-metal)	(iv) Hardest natural substance

Q. Identify the non-metal which is a good conductor of electricity.

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