Carbon and its Compounds Test

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Carbon and its Compounds Test - 21

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Question 1
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$$Z-\overset{Z}{\overset{|}{\underset{Z}{\underset{|}{X}}}}-\overset{Z}{\overset{|}{\underset{Z}{\underset{|}{X}}}}-\overset{Z}{\overset{|}{X}}=Y$$

Given here is the structural formula of the compound formed of X, Y and Z elements.

X is a tetravalent element and exhibits catenation property. Y belongs to group 16 and period 2. Z is the only non-metal present in the reactivity series.

The next member of homologous series of the above compound is:

A
$$CH_3 CHO$$

B
$$CH_3 CH_2 CH_2 CH_2 CHO$$

C
$$CH_3 CH_2 CH_2 CHO$$

D
none of these

Solution

X is carbon, a tetravalent element that exhibits catenation property.

Y is oxygen, element that to group 16 and period 2.

Z is hydrogen, the only non-metal present in the reactivity series.

This compound has 3 carbon atoms and can be written as:
$$H-\overset{H}{\overset{|}{\underset{H}{\underset{|}{C}}}}-\overset{H}{\overset{|}{\underset{H}{\underset{|}{C}}}}-\overset{H}{\overset{|}{C}}=O$$

So, the next member of homologous series of the above compound will have 4 carbon atoms.
Question 2
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Structure of diamond is :

A
linear

B
tetrahedral

C
octahedral

D
hexagonal

Solution
Question 3
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Which of the following is an allotropic form of carbon?

A
Diamond

B
Graphite

C
Fullerene

D
All of these

Solution

There are various allotropes of carbon: diamond, graphite, lonsdaleite, fullerene, C-540, C-70, amorphous carbon, carbon nanotube. The major ones are diamond, graphite, and fullerene.
Question 4
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Which is/are the characteristic(s) of Diamond?

A
Opaque

B
Hardness

C
Both $$A$$ and $$B$$

D
Conductor of electricity

Solution

Diamond is a transparent, hard and poor conductor of electricity. In fact, diamond is the hardest known substance on earth. The hardness is due to the presence of strong covalent bonds between carbon atoms. Hence, the option (B) is the correct answer.
Question 5
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Diamond is not a good conductor of electricity because :

A
it is very hard

B
it's structure is very compact

C
it is not water soluble

D
it has no free electrons to conduct electric current

Solution

Diamond is made up of carbon atoms bind together by the strong covalent bond in a tetrahedral arrangement. Due to this strong covalent bond, electrons are localised (free electrons are not there), and thus, diamond is a bad conductor of electricity.

Hence, option D is correct.
Question 6
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Graphite is used in making electrodes because:

A
It has high melting point

B
It is soft and slippery

C
It is good conductor of electricity

D
None of these

Solution

Graphite is used in making electrodes because it is good conductor of electricity due to the presence of free electrons. One valence electron of each carbon atom remains free and thus it is a good conductor of electricity.
Question 7
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The most stable fullerene is :

A
$$C_{60}$$

B
$$C_{70}$$

C
$$C_{100}$$

D
$$C_{90}$$

Solution

C-60 is the most stable form and it led the scientists to the conclusion that the cluster must be a spheroidal closed cage in the form of icosahedron.
Question 8
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During decarboxylation of ethanoic acid with soda lime $$(NaOH+CaO), \ CO_2$$ is removed as :

A
$$CO_2$$

B
$$CO$$

C
$$Na_2CO_3$$

D
$$CaCO_3$$

Solution

$$\underset{sodium \, ethanoate}{CH_3 - COONa} \xrightarrow[\Delta]{Soda-lime (mixture \, of \, NaOH \, and \, CaO \,in \, 3 : 1 \, ratio)} \underset{Methane}{CH_4} + Na_2CO_3$$
Question 9
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Fullerene is an allotrope of carbon which is similar to a football. It has 60 carbon atoms joined together and no other element in it. There are various types of fullerenes. $$C_{60}, C_{70}, C_{74}$$ and $$C_{75}$$ are the members of the fullerene family. But $$C_{60}$$ (pronounced as C sixty) is the most stable and most studied form of fullerenes. What do you think is the nature of the bond which is joining these atoms together?

A
Ionic

B
Covalent

C
Hydrogen

D
Co-ordinate

Solution

Carbon-carbon bonds in fullerene are covalent. Carbon forms covalent bond.
Question 10
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Which of the following is/are saturated hydrocarbon?

A
$$C_2H_6$$

B
$$C_2H_4$$

C
$$C_2H_5$$

D
All of these

Solution

The general formula for saturated hydrocarbons is $$C_nH_{2n+2}$$.

Alkane - $$C_nH_{2n+2}$$
Alkene - $$C_nH_{2n}$$
Alkyene - $$C_nH_{2n-2}$$

So, $$C_2H_6$$ is saturated hydrocarbon.

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Re-Attempt Weekly Quiz Competition

Carbon and its Compounds Test - 21

Result

Carbon and its Compounds Test - 21

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SHARING IS CARING

Question 1

$$CH_3 CHO$$

$$CH_3 CH_2 CH_2 CH_2 CHO$$

$$CH_3 CH_2 CH_2 CHO$$

none of these

Solution

Question 2

linear

tetrahedral

octahedral

hexagonal

Solution

Question 3

Diamond

Graphite

Fullerene

All of these

Solution

Question 4

Opaque

Hardness

Both $$A$$ and $$B$$

Conductor of electricity

Solution

Question 5

it is very hard

it's structure is very compact

it is not water soluble

it has no free electrons to conduct electric current

Solution

Question 6

It has high melting point

It is soft and slippery

It is good conductor of electricity

None of these

Solution

Question 7

$$C_{60}$$

$$C_{70}$$

$$C_{100}$$

$$C_{90}$$

Solution

Question 8

$$CO_2$$

$$CO$$

$$Na_2CO_3$$

$$CaCO_3$$

Solution

Question 9

Ionic

Covalent

Hydrogen

Co-ordinate

Solution

Question 10

$$C_2H_6$$

$$C_2H_4$$

$$C_2H_5$$

All of these

Solution

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