Properties and Usage of Graphite

Q.

Explain the difference in properties of diamond and graphite on the basis of their structures.

Q.

The incorrect statement related to allotropes of carbon is/are:

1. Graphite is the most stable allotropes of carbon and having a two dimensional sheet like structure of hexagonal rings of carbon

2. Diamond is the hardest allotrope of carbon and having a three dimensional network structure of

3. Fullerene (C60) is recently discovered non-crystalline allotrope of carbon having a football-like structure

4. Electrostatic force of attraction acts between the layers of graphite 6.14 Å away from each other

Q.

What is the preparation method of white phosphorus?

Q.

Why graphite rods are used in the process of electrolyses

Q. Is diamond a bad conductor of heat and electricity? Why?

Q.

Tick the appropriate

(iv) Which of the following is used as a lubricant.

1. Diamond

2. Graphite

3. Sulfur

4. Iodine

Q. (a) Why is diamond used for making cutting tools (like glass cutters) but graphite is not?

(b) Why is graphite used for making dry cell electrodes but diamond is not?

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Write two physical properties for each one.
a. Diamond
b. Charcoal

Q.

Fill in the blanks

_________ allotropes of carbon do not have a definite geometric shape.

Q. Why is diamond is the hardest naturally occurring substance

Q. Graphite on heating with oxygen produces _______.

1. carbon dioxide
2. hydrogen peroxide
3. nitrogen dioxide
4. carbon monoxide

Q. Why graphite has higher melting point than diamond ?

Q. Graphite has a melting point than/to that of diamond.

1. higher
2. lower
3. equal

Q.

The incorrect statement related to allotropes of carbon is/are

1. Diamond is the hardest allotrope of carbon and having a three dimensional network structure of

2. Fullerene (C60) is recently discovered non-crystalline allotrope of carbon having a football-like structure

3. Graphite is the most stable allotropes of carbon and having a two dimensional sheet like structure of hexagonal rings of carbon

4. Electrostatic force of attraction acts between the layers of graphite 6.14 Å away from each other

Q. Identify the uses of graphite.

1. Dry lubricant
2. Lead pencil
3. Electrical wires
4. In crucibles