Carbon and its Compounds Test

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Carbon and its Compounds Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Graphite is used as a lubricant in machines because it has a very high melting point and also it :

A
is crystalline

B
has layer structure

C
is a giant molecule

D
is a liquid at room temperature

Solution

Graphite has a layered structure of hexagonal rings. It has one carbon atom covalently bonded to three other carbon atoms, forming a giant hexagonal molecular structure with layers held by weak Van der Waals' forces. As the Van der Waals' forces between the layers are weak, the layers can easily slide over each other when pressured and is soft. Thus, it can be used as a lubricant.
Question 2
1 / -0

Pentane has the molecular formula $$ C_{5}H_{12} $$. It has:

A
10 covalent bonds

B
12 covalent bonds

C
16 covalent bonds

D
17 covalent bonds

Solution

$${ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 3 }$$

Pentane has $$12\ C-H$$ bonds and $$4\ C-C$$ bonds. So, in total it has 16 covalent bonds.
Question 3
1 / -0

$$ NaHC{ O }_{ 3 }+C{ H }_{ 3 }COOH\longrightarrow C{ H }_{ 3 }COONa+C{ O }_{ 2 }+{ H }_{ 2 }O $$,
This reaction is used as a test of carboxylic acid because :

A
gas is confirmed when it turns lime water black

B
gas is confirmed when it turns lime water milky

C
gas is confirmed when it turns lime water light green

D
gas is confirmed when it turns lime water brown

Solution

Sodium hydrogen carbonate is also known as sodium bicarbonate and it reacts with acetic acid to give sodium acetate and carbon dioxide gas is evolved as this gas is confirmed when it turns lime water milky. So, it is a confirmatory test for carboxylic acids.
Question 4
1 / -0

Which of the following is not a use of graphite ?

A
Lubricant

B
Electrodes

C
Black paints

D
High precision thermometers

Solution

Graphite is a good conductor of electricity but cannot conduct heat hence it is used as electrodes in numerous cells but cannot be used in high precision thermometers.

Whereas the diamond can conduct heat, therefore, it can be used in high precision thermometers.

So, the correct option is $$D$$
Question 5
1 / -0

The soap molecule has a

A
hydrophobic head and a hydrophilic tail

B
hydrophobic head and a hydrophobic tail

C
hydrophilic head and a hydrophobic tail

D
hydrophilic head and a hydrophilic tail
Question 6
1 / -0

In diamond, the bonding between carbon atoms is :

A
co-ordinate

B
ionic

C
hydrogen

D
covalent

Solution

In diamond, each carbon atom is covalently bonded to four other carbon atoms. A lot of energy is needed to separate the atoms in diamond.

This is because covalent bonds are strong and diamond contains many covalent bonds.

Hence, the correct option is $$D$$
Question 7
1 / -0

The first fullerene was discovered in :

A
$$1970$$

B
$$1967$$

C
$$1997$$

D
$$1985$$

Solution

The first fullerene was discovered in 1985 by Sir Harold W.Kroto, Smalley and Robert F.Curl. They obtained a cage like molecules composed of 60 carbon atoms.
Question 8
1 / -0

Density of graphite is :

A
$$0.5\ g/cm^3$$

B
$$2.266\ g/cm^3$$

C
$$1.08\ g/cm^3$$

D
none of the above

Solution

Crystal density of graphite is $$2.266 g/cm^3$$ as compared with $$3.53 g/cm^3$$ for diamond.
In the graphite structure, only three of the four valence electrons of carbon form regular covalent bonds with adjacent carbon atoms.
Question 9
1 / -0

Two adjacent layers in graphite are bonded by comparatively _______ forces.

A
strong

B
weak

C
both A and B

D
none of these

Solution

Graphite is an allotrope of carbon. Each carbon is covalently bonded to the other three carbon atoms. It contains layers of carbon. The layers slid over each other easily because of the weak Van der Walls' forces between them.
Question 10
1 / -0

Which of the following is a crystalline allotrope of carbon?

A
Charcoal

B
Coal

C
Fullerene

D
Lamp black

Solution

Carbon have these 3 crystalline allotrope: diamond, graphite and fullerene. All these three forms exist as a crystal, not molecule.

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Re-Attempt Weekly Quiz Competition

Carbon and its Compounds Test - 20

Result

Carbon and its Compounds Test - 20

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SHARING IS CARING

Question 1

is crystalline

has layer structure

is a giant molecule

is a liquid at room temperature

Solution

Question 2

10 covalent bonds

12 covalent bonds

16 covalent bonds

17 covalent bonds

Solution

Question 3

gas is confirmed when it turns lime water black

gas is confirmed when it turns lime water milky

gas is confirmed when it turns lime water light green

gas is confirmed when it turns lime water brown

Solution

Question 4

Lubricant

Electrodes

Black paints

High precision thermometers

Solution

Question 5

hydrophobic head and a hydrophilic tail

hydrophobic head and a hydrophobic tail

hydrophilic head and a hydrophobic tail

hydrophilic head and a hydrophilic tail

Question 6

co-ordinate

ionic

hydrogen

covalent

Solution

Question 7

$$1970$$

$$1967$$

$$1997$$

$$1985$$

Solution

Question 8

$$0.5\ g/cm^3$$

$$2.266\ g/cm^3$$

$$1.08\ g/cm^3$$

none of the above

Solution

Question 9

strong

weak

both A and B

none of these

Solution

Question 10

Charcoal

Coal

Fullerene

Lamp black

Solution

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