Diamond

Q.

Write three differences between graphite and diamond.

Q. In a diamond, each carbon atom is bonded to four other carbon atoms to form:

1. A rigid three-dimensional structure
2. A structure in the shape of a football
3. A structure of a ring
4. A hexagonal array

Q.

Pencil lead is made up of a non-metal called:

1. Lead

2. Carbon

3. Iron

4. Copper

Q. The name ‘carbon’ is derived from the Latin word carbo.

1. True
2. False

Q.

Give two uses of :

(a) graphite

(b) diamond

Q.

____ is a good conductor of electricity.

1. Diamond

2. Graphite

3. Charcoal

4. Soot

Q.

The structure of diamond and graphite is respectively:

1. 3D-Tetrahedral, 3D-tetrahedral

2. 3D-Tetrahedral, hexagonal layered

3. 3D-Pyramidal, 3D-pyramidal

4. 2D-Tetrahedral, hexagonal layered

Q. Read the given statements and select the correct option.​
Statement 1: Gold and silver are commonly used in making ornaments.
Statement 2: They are non-lustrous in nature.

1. Both statement 1 and 2 are false.​
2. Both statements are true and statement 2 is the correct explanation of statement 1.​
3. Statement 1 is true and statement 2 is false.​
4. Both statements are true but statement 2 is not the correct explanation of statement 1.​

Q.

Name the products formed when :

(a) wood is burnt in the absence of air.

(b) bone is heated in the absence of air.

(c) diamond is burnt in air at 900${}^{\circ }$C.

(d) graphite is subjected to high pressure and 3000${}^{\circ }$ C temperature.

Q. __________ is the hardest substance that occurs naturally.

1. Diamond
2. Coke
3. Coal
4. Graphite

Q. What is Fullerene? Give its occurrence and uses.

Q.

Choose the correct alternative :

(a) In a combined state, carbon occurs as

(i) coal

(ii) diamond

(iii) graphite

(iv) petroleum

(b) A crystalline form of carbon is

(i) lamp black

(ii) gas carbon

(iii) sugar

(iv) fullerene

(c) Graphite is not found in

(i) Bihar

(ii) Maharashtra

(iii) Orissa

(iv) Rajasthan

(d) Diamond is used for

(i) making the electrodes of electric furnaces.

(ii) making crucible for melting metals.

(iii) cutting and drilling rocks and glass.

(iv) making carbon brushes for electric motors.

(e) Carbon forms innumerable compounds because

(i) it has four electrons in its outermost shell.

(ii) it behaves as a metal as well as a non-metal.

(iii) carbon atoms can form long chains.

(iv) it combines with other elements to form covalent compounds.

Q.

Which is the hardest known substance? What is the chemical composition of this substance?
[2 MARKS]

Q. is used in the tools used for cutting glasses.

1. Diamond
2. Graphite
3. Coal

Q.

How is Graphite prepared artificially?

Q.

Which material is used for making crucibles?

1. Sulphur
2. Silicon
3. Graphite
4. Phosphorus

Q.

___ is used as the lead of a pencil.

1. Pb

2. PbS

3. Graphite

4. FeS

Q.

Diamond can be considered as a resource for:

1. Nonrenewable Resource

2. Renewable Resource

3. Fuel

4. Fossil

Q.

Name the following :

(a) The hardest naturally occurring substance.

(b) A greyish black non-metal that is a good conductor of electricity.

(c) The third crystalline form of carbon.

Q. Assertion: Diamond and graphite have the same physical properties.

Reason: Both of them are made from the same element.

1. Both assertion and reason are true and the reason is the correct explanation for the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation for the assertion.
3. The assertion is true but the reason is false.
4. The assertion is false but the reason is true.

Q. Why are diamonds extremely hard in nature and have very high melting points?

Q.

Give reasons for the following:

Diamond is used in space probes because -

Q. The weight of diamond is expressed in terms of ______.

1. milligram
2. centigram
3. carats
4. kilogram

Q.

In diamond, each carbon atom is linked to four other carbon atoms.

Q. Which statement is incorrect about diamond?

1. Diamond is a poor conductor of electricity
2. Diamond is insoluble in solvents
3. Diamond is transparent
4. Diamond is not an allotropic form of carbon

Q.

Which of the following is/are false about diamond?

1. It has a high melting point

2. Average value of C-C bond order is 2.

3. It is a good conductor of electricity

4. It is insoluble in solvents

Q.

Assertion (A): Diamond is a better conductor of heat than metals.

Reason (R): Diamond has no free electrons.

1. Both A and R are true and R is the correct explanation of A.

2. Both A and R are true, but R is not the correct explanation of A.

3. A is true and R is false.

4. A is false and R is true.

Q.

What are the different allotropes of carbon?

1. Diamond

2. Graphite

3. Calcium powder

4. Fullerene

Q.

Why is graphite used to make pencil leads?

Q.

Statement 1: Fake diamonds are identified easily using the thermal property of diamonds.

Statement 2: Diamond has five times more thermal conductivity than copper.

1. Only statement 1 is true

2. Only statement 2 is true

3. Both statement 1 and statement 2 are wrong

4. Statement 2 is the correct explanation for statement 1