Diamond

Q. Why is diamond hardest substance on Earth?

1. Due to extended ionic bond formation
2. Due to $s{p}^2$ hybridised carbons
3. Due to extended covalent bond formation
4. Due to multiple $\pi$ bond formation.

Q. The $C-C$ bond length is maximum in

1. $\text{graphite}$
2. $C_{70}$
3. $C_{60}$
4. $\text{diamond}$

Q. Diamond, graphite, silicates are examples of :

1. Ionic solids
2. Covalent solids
3. Metallic solids
4. Molecular solids

Q.

What is the oxidation state of carbon atoms in diamond and graphite?

Q. The space lattice of graphite is:

1. Cubic
2. Tetragonal
3. Rhombic
4. Hexagonal

Q. Which of the following statement(s) is/are correct?

1. Graphite is harder than diamond
2. In diamond each C-atom is tetrahedrally surrounded by 4-equidistant neighbour
3. Diamond shows less electrical conductivity as compare to graphite
4. Diamond has the highest thermal conductivity of any known substance

Q.

Write short notes on the following:

Diamond

Q. Which of the following types of forces bind together the carbon atoms in diamond?

1. Van der Waals forces
2. Ionic
3. Covalent
4. Dipolar

Q.

The nature of bonding in graphite is

1. Ionic

2. Coordinate

3. Covalent

4. Metallic

Q. The $C-C$ bond length is maximum in

1. $\text{graphite}$
2. $C_{70}$
3. $C_{60}$
4. $\text{diamond}$

Q. Why is diamond hardest substance on Earth?

1. Due to extended ionic bond formation
2. Due to extended covalent bond formation
3. Due to $s{p}^2$ hybridised carbons
4. Due to multiple $\pi$ bond formation.

Q.

Which allotrope of phosphorus has a higher density?

Q.

How is graphite prepared?

Q. The nature of chemical bond in diamond is:

1. Metallic
2. Coordinate covalent
3. Ionic
4. Covalent

Q. 27. Formation of Mesitylene by acetone mechanism . Explain .

Q. Diamond is a bad conductor of electricity but a good conductor of heat.

1. True
2. False

Q.

Where is energy derived from for the reaction of synthesis of ammonia by nitrogenase?

Q.

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

Q.

What are the different types of bonds?

Q. What is the hybridization of phosphorus in $PC{l}_5$?

1. $s{p}^3$
2. $s{p}^2$
3. $s{p}^{3}d$
4. $s{p}^3{d}^2$

Q.

The weight of the diamond in expressed in

1. Carat

2. Milligram

3. Gram

4. None of these

Q.

Complete the following sentences:

Diamonds are coloured because of…..

Q. _______ is the hardest known natural substance.

1. Graphite
2. Diamond
3. Fullerene
4. None of these

Q. The purest form of carbon is?

1. Graphite
2. Diamond
3. Fullerene
4. Lonsdaleite

Q. Graphite is a non-metal. But still it conducts electricity. Explain.

Q. Which has highest melting point?

1. tin
2. silicon
3. diamond
4. lead

Q. csBr has cubic in diamond carbon atom occupy fcc lattice points as well as alternate tetrahedral voids . if edge length of the unit cell is 3.56pm , then find radious of carbon atom

Q.

_________ is a non-metal, yet a good conductor of electricity.

Q.

Fill in the blanks with suitable words:

One carat is equal to……………. grams

Q.

Which of the following is an amorphous solid?

1. Salt

2. Diamond

3. Graphite

4. Glass