Q57 of 312 Page 223

The pencil leads are made of mainly:

Graphite is used for making lead for pencil as it is soft and leaves black mark on the paper.

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55 The hydrocarbon which has alternate single and double bonds arranged in the form of a ring is: 56 Which of the following cannot exhibit isomerism? 58 The number of isomers formed by the hydrocarbon with molecular formula C5H12 is: 59 The number of carbon atoms joined in a spherical molecule of buckministerfullerence is: