Fullerenes

Q. Fullerene has six membered and five membered carbon rings.

1. 20
2. 22
3. 12
4. 6
5. 15

Q. How many pentagons and hexagons are present in one molecule of fullerene?

1. 20 pentagons and 12 hexagons
2. 12 pentagons and 20 hexagons
3. 30 pentagons and 30 hexagons
4. 24 pentagons and 36 hexagons

Q. MgFe2O4 has spinel structure, then the percentage of tetrahedral voids and octahedral voids occupied are respectively 1) 25% and 37.5% 2) 12.5% and 50% 3) 25% and 25% 4) 37.5% and 25%

Q.

What are the three common forms of Carbon?

Q.

Graphene is an allotrope of carbon. What is the shape of the rings in its structure which is formed due to carbon combining with each other through covalent bonds?

1. Circular

2. Pentagon

3. Hexagon

4. Square

Q.

Carbon is an example of

1. Element.

2. Compound.

3. Mixture

4. None of the above.

Q.

Give two uses of each of the following:

1. Diamond
2. Graphite
3. Lampblack
4. Coal
5. Wood charcoal

Q.

Name two crystalline forms of carbon.

Q. what is the meaning of bcc packing in two layers and what will be its coordination no. in that case ?