Q5 of 33 Page 223

Even though it is a non-metal, graphite conducts electricity. It is due to the presence of ___________ . (free electrons / bonded electrons)

free electrons

Explanation: Being a non-metal, graphite is a good conductor of electricity due to the following reasons:


i. In graphite, carbon atoms are arranged in different layers.


ii. In each layer, every carbon atom is linked to three


neighbouring carbon atoms.


iii. Thus, the fourth electron of each carbon atom is free to move


continuously within the entire layer.


iv. Because of the presence of these free electrons in different


layers, graphite becomes a god conductor of electricity.


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3

Assertion: Due to catenation a large number of carbon compounds are formed.

Reason: Carbon compounds show the property of allotropy.


Does the reason hold good for the given Assertion?


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Buckminster fullerene is the allotropic form of _______ .(Nitrogen / Carbon / Sulphur)

 6

The formula of methane is CH4 and its succeeding member ethane is expressed as

C2H6. The common difference of succession between them is _______ .(CH2 / C2 H2)


 7

IUPAC name of the first member of alkyne is ___________ . (ethene / ethyne)