Allotropes of Carbon

Q.

Which of the following is not a crystalline allotropic form of carbon?

1. Coal

2. Fullerene

3. Diamond

4. Graphite

Q.

Apart from Carbon, which other elements commonly form allotropes?

1. Sulphur and Boron.

2. Oxygen, Phosphorus and Sulphur

3. Oxygen and Phosphorus

4. Oxygen, Phosphorus and Barium

Q.

Different allotropic forms of an element have different chemical properties but same physical properties.

1. True

2. False

Q.

The phenomenon by which an element exists in two or more different crystalline or amorphous forms is called ___.

Q. Write a brief note on the occurrence of carbon.

Q. Which of the following is the crystalline form of carbon?​

1. Lamp black​
2. Gas carbon​
3. Fullerene
4. Sugar​

Q.

Which of the following allotropes of carbon do NOT conduct electricity?​

I. Graphite​

II. Diamond​

III. Fullerene

1. I and III
2. Only I
3. II and III
4. I and II

Q. Select the correct option:​

A. Amorphous solids possess definite and regular geometry.​​

B. The carbon content in lignite is more than that of peat.​​

C. Bituminous is the purest variety of coal.​​

D. Coal and coke are amorphous allotropes of carbon​. ​

Q. Diamond has a _______ structure while graphite has a ________ structure.

1. tetrahedral, hexagonally layered
2. pentagonal, hexagonally layered
3. hexagonally layered, octahedral
4. tetrahedral, square pyramidal

Q. Which of the following molecules is called buckminsterfullerene?

1. C₅₀
2. C₉₀
3. C₆₀
4. C₈₀

Q. Why are carbon and its compound used as fuels?​