Allotropes of Carbon

Q.

The hybridization of carbon in diamond, graphite, and acetylene is respectively:

1. $s{p}^3,sp,s{p}^2$

2. $sp,s{p}^2,s{p}^3$

3. $s{p}^3,s{p}^2,sp$

4. $s{p}^2,s{p}^3,sp$

Q.

Graphite cannot be classified as ..............

(a) conducting solid (b) network solid

(c) covalent solid (d) lonic solid

Q. What is the correct order of the following elements with respect to their density?

1. Cr < Fe < Co < Cu < Zn
2. Cr < Zn < Co < Cu < Fe
3. Zn < Cu < Co < Fe < Cr
4. Zn < Cr < Fe < Co < Cu

Q.

Why Diamond is harder than Graphite?

Q.

The major binding force of diamond, silicon and quartz is

1. Electrostatic force

2. Electrical attraction

3. Covalent bond force

4. Non-covalent bond force

5. Van der Waals forces

Q. If the standard molar enthalpy change for combustion of graphite powder is $-2.48\times {10}^{2}kJ{\text{mol}}^{-1}.$ the amount of heat generated on combustion of $1g$ of graphite powder in $kJ$ is
(Nearest integer)

Q. Choose the incorrect statement regarding characteristic of crystalline solids:

1. Definite characteristic geometrical shape
2. Melt at a sharp and characteristic temperature
3. Long range order
4. Isotropic in nature

Q. Among the following compounds, how many of them shows chirality?

Q. Which of the following statements is correct regarding $C_{60}$ fullerene?

1. It contains 12 six membered ring and 20 five membered ring.
2. It contains 20 six membered ring and 12 five membered rings
3. It consists of 25 six membered and 12 five membered rings.
4. It consists of 12 six membered and 25 five membered rings

Q.

Piezoelectric crystals are used in

1. Radio

2. TV

3. Freeze

4. Record player

Q.

How would you say that all ferroelectric solids are piezoelectric, but all piezoelectric solids are not ferroelectric solids?? Explain to satisfy this statement.

Q. Which of the following pair consists of only network solid?

1. $C{O}_2$, Diamond
2. $CO,C{O}_2$
3. Graphite, $C{O}_2$
4. Diamond, Graphite

Q.

Graphite can be converted to a diamond when subjected to temperature and pressure of about

1. 3500° C and 10, 000 atm

2. 5000° C and 1, 00, 000 atm

3. 3000° C and 1, 00, 000 atm

4. 300° C and 1000 atm

Q.

Which isotope of carbon is used for carbon dating?

Q.

Explain the arrangement of carbon atoms in graphite.

Q.

What is the definition of allotropes?

Q.

What do you understand by (a) inert pair effect (b) allotropy and (c) catenation?

Q.

Why is Graphite known as black lead?

Q. What is piezoelectric crystal

Q. What is the correct order of the following elements with respect to their density?

1. Cr < Fe < Co < Cu < Zn
2. Cr < Zn < Co < Cu < Fe
3. Zn < Cu < Co < Fe < Cr
4. Zn < Cr < Fe < Co < Cu

Q.

Graphite is a good conductor of electicity due to the presence of ............

(a) lone pair of electrons (b) free valence electrons

(c) cations (d) anions

Q.

Write two physical properties of diamonds.

Q. A Graphite has a layer like structure.
B. The distance between two layers in graphite is 20 pm
C. Each layer is composed of planar hexagonal rings
Which of the above statement (s) is /are true?

1. A & C
2. A & B
3. only A
4. A, B & C

Q.

In which of the following substances the carbon atom is arranged in a regular tetrahedral structure

[NCERT 1978]

1. Diamond

2. Benzene

3. Graphite

4. Carbon black

Q.

What are the basic constituent particles forming diamond crystals?

1. Anions

2. Atoms

3. Cations

4. Molecules

Q.

What are allotropes? Sketch the structure of two allotropes of carbon namely diamond and graphite. What is the impact of structure on physical properties of two allotropes?

Q.

Name the following :

Artificially made allotrope of carbon.

Q.

Which element occurs in free state?

1. Germanium

2. Tin

3. Silicon

4. Carbon

Q. Which of the following is correct for A and B?

1. Both A and B are chiral
2. Only B is chiral
3. Only A is chiral
4. Neither A nor B is chiral

Q. In a crystal of diamond:
(i) How many carbon atoms are present per unit cell?
(ii) What type of lattice does diamond crystallize in?
(iii) How many carbon atoms surround each carbon atom?
(iv) How are they arranged?