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Carbon Nitrogen and their Compounds


19. 

Which of the following is true about carbon:
I. Symbol : C ;
II. Atomic Number : 6
III. Atomic Mass : 12
IV. Valency : 4

Answer : D. I,II,III and IV

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20. 

Which is defined as the property by which an element can exist in more than one form that are physically different but chemically similar.

Answer : B. Allotropy

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21. 

Carbon chemistry is also called as _________

Answer : C. living chemistry

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22. 

Carbon exhibits allotropy and occurs as
i) Diamond, a beautiful crystalline substance
ii) Graphite, a soft greyish black crystalline substance
iii) Amorphous carbon, black residue left when carbon compounds are heated.

Answer : D. I,II and III

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23. 

Which of the following are true:
I. The crystal of diamond is very hard and has high melting and boiling points.
II. Diamond is the purest allotrope of carbon.
III. Diamonds are supposed to have been formed due to the crystallization of carbon from molten mass under a very high pressure.
IV. Diamond is used for cutting glass, marbles and for drilling rocks.

Answer : D. I,II,III and IV

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24. 

Which of the following is true:
I.Amorphous carbon is the most reactive form of carbon.
II. It burnsrelatively easily in air
III. It is attacked by strong oxidising agents

Answer : D. I,II and III

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