Question

A non-metal X exists in two different forms Z and Y. Z is hardest natural substance, while Y is a
good conductor of electricity. The non-metal X can form two oxides A and B. A is neutral
whereas B is acidic. A is combustible whereas B puts off fire. Identify X, Y, Z, A and B. Also
give reaction of A with oxygen and name the gas so formed.
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Answer 1

Explanation:

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,Yand Z? Accepted Answer: The non-metal X is carbon.