Carbon, Catenation and Tetravalency

Q.

Why carbon atom cannot lose or gain electron to form octet

Q.

Give the definition of a covalent compound.

Q.

Thermodynamically, which form of carbon is the most stable?

1. Coal

2. Graphite

3. Fullerenes

4. Diamond

Q.

Describe the structure of Graphite.

Q.

Which of the following is not the crystalline allotropic form of carbon?

1. Diamond

2. Graphite

3. Fullerene

4. Coke

Q.

Which of the following are allotropes of carbon?

1. Diamond

2. Graphite

3. Plastic

4. Coal

Q. Benzene and toluene form nearly ideal solutions. At T = 300 K, the vapor pressures of the pure liquids are, 103 and 32 torr. a) A liquid mxiture is composed of 3 mol toluene and 2 mol benzene. If the pressure over the mixture at 300k is gradually reduced, at what pressure does the first vapor form? b) What is the compostion of the first trace of vapor formed? c) If the pressure is reduced further, what is the composition of the last trace of liquid? d) At what Pressure does the last trace of liquid disappear? e) What will be the pressure, the composition of the liquid, and the composition of the vapor when one mole of the mixture has been vaporized?

Q.

Silicon belonging to same group as Carbon and yet cannot form compounds like Carbon. Why?

1. Silicon has smaller atomic radius

2. Silicon has greater reducing characteristics

3. Silicon has greater oxidising characteristics

4. Silicon has greater atomic radius

Q.

Why does carbon form compounds mainly by covalent bonding?

Q.

What happens when carbon and its compounds are burnt in the presence of oxygen?

1. CO₂ gas is released.

2. SO₂ gas is released.

3. O₂ gas is released.

4. H₂ gas is released.

Q.

The reason behind large number of organic compounds is ___

1. Unique bonding character with Oxygen

2. Position of oxygen in periodic table

3. Unique nature of Carbon atoms

4. Unique nature of bonding with hydrogen

Q.

Which of the following properties are unique about carbon?

1. Tetravalency

2. Catenation

3. Allotropy

4. Ability to form coordinate covalent bonds

Q.

What happens when carbon and its compounds are burned in oxygen?

1. H₂ gas is released.

2. CO₂ gas is released.

3. SO₂ gas is released.

4. O₂ gas is released.

Q.

Which of the following will give carbon dioxide on being heated in an excess of oxygen?

1. Diamond

2. Graphite

3. Charcoal

4. All of these

Q.

What is the term used for a form of carbon which helps in absorbing unpleasant smell from drinking water and refrigerators?

1. Buckyballs

2. Diamonds

3. Activated charcoal

4. Carbon nanotubes

Q. is the property of an element by which it exists in different forms.

1. Allotropy
2. Catenation
3. Tetravalency

Q. Methane on complete combustion gives a _______ flame.

1. blue
2. yellow
3. red
4. green

Q.

Name the compound formed when hydrogen burns in air.

Q. What happens to carbon when it reacts?

Q. Minimum carbon atoms are required to form a branched chain hydrocarbon.

1. three
2. four
3. five
4. six

Q.

___ is the property by which an element tends to form chains of identical atoms.

1. Isomerism

2. Tetravalency

3. Catenation

4. Allotropy

Q.

What is reason behind compound building ability of Carbon?

1. Position of the element in periodic table

2. Complex branching ability of element

3. Strength of the element

4. Inert characteristics of element

Q.

Carbon can never form a quadruple bond.

1. True

2. False

Q.

what is the boiling point of diamond?

Q. Chemical linkage into chains of atoms of the same element is known as catenation.

1. True
2. False

Q.

In methane, the valency of carbon is:

1. four

2. two

3. one

4. three

Q.

Select the most significant property of carbon.

1. Melting point

2. ​Catenation

3. Boiling point

4. Ionization property

Q.

What is reason behind compound building ability of Carbon?

1. Position of the element in periodic table

2. Complex branching ability of element

3. Strength of the element

4. Inert characteristics of element

Q.

Diamond is composed of which element?

1. Boron

2. Carbon

3. Silicon

4. Aluminium

Q.

The melting point of alkanes ___ with ___ in molecular weight.

1. decreases, increasing

2. increases, decreasing

3. remains constant, decreasing

4. increases, increasing