Carbon and its Compounds Test

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Carbon and its Compounds Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

Compound with a molecular formula $$C_7H_{16}$$ will have:

A
single covalent bonds only.

B
at least one double bond.

C
at least one triple bond.

D
none of these

Solution

Compound with molecular formula $$C_7H_{16}$$ satisfies the general formula of alkanes i.e. $$C_nH_{2n+2}$$ with $$n= 7$$. Hence it can only have single covalent bonds between the carbon atoms.
Question 2
1 / -0

LPG releases ______ of the $$CO_2$$ per kWh produced by oil.

A
89%

B
81%

C
79%

D
0%

Solution

LPG releases 81% of the $$CO_2$$ per Kwh produced by oil.
LPG, at atmospheric pressure, has a higher calorific value $$94\ MJ/m^3$$ which is equivalent to $$26.1 \ kWh/m^3$$.
Question 3
1 / -0

LPG burns more cleanly than higher molecular weight hydrocarbon :

A
because it releases volatile pollutants

B
because it releases less pollutants

C
because it releases pollutants which are toxic

D
because it releases more pollutants

Solution

LPG burns more cleanly than higher molecular weight hydrocarbon because it releases fewer pollutants. Being a gas, LPG does not cause ground or water pollution hazards, but it causes air pollution.
Note: LPG is liquefied petroleum gas which is a compound of butane and propane used in cooking fuel ( in heating appliances, cooking equipment), motor fuel (in vehicles), and refrigeration.
Question 4
1 / -0

The chief source(s) of oils used to make soap is/are:

A
petroleum products

B
coal and coke

C
plants and animals

D
none of the above

Solution

The chief source(s) of oils used to make soap is/are plants and animals. This is because soaps are a combination of animal fats or plant oils. They are used to clean and treat the skin and clean utensils and clothes. The first of soaps were made from the remains of a goat and ash of wood. A substance similar to foam formed which hardened once it cooled.
Hence, option C is correct.
Question 5
1 / -0

Iso-octane reacts with oxygen:

A
Endothermically

B
Exothermically

C
Only some activation energy is required

D
Doesn't react

Solution

$$2,2,4-$$trimethylpentane (isooctane), widely used in gasoline, has a chemical formula of $$C_8H_8$$ and it reacts with oxygen exothermically as shown below:
$$2C_8H_{18}(l) + 25O_2(g) \longrightarrow 16CO_2(g) + 18H_2O(g)$$
Question 6
1 / -0

Which of the following do not give an addition reaction?

A
Alkanes

B
Alkenes

C
Alkynes

D
Carbonyl compounds

Solution

Alkanes are saturated hydrocarbons. In them, all valencies of carbons are satisfied by single covalent bonds. Hence, they do not give addition reaction.

Addition reaction is only shown by unsaturated hydrocarbons.
Question 7
1 / -0

Which of the given statements is true?

A
The ionic end of soap dissolves in water while the carbon chain dissolves in oil.

B
The ionic end of soap dissolves in oil while the carbon chain dissolves in water.

C
The ionic end of soap and the carbon chain both dissolve in water.

D
The ionic end of soap and the carbon chain both dissolve in oil.

Solution

Statement (A) is a true statement.
The ionic end of soap dissolves in water while the carbon chain dissolves in oil.
The ionic end is polar in nature as it contains carboxylate ions. Since we know that like dissolves like, this end dissolves in polar solvent like water.
The carbon chain is hydrophobic in nature. It dissolves in a non-polar solvent like oil.
Question 8
1 / -0

Carbon compounds with one multiple bond are called :

A
alkenes

B
alkynes

C
alkanes

D
both alkenes and alkynes

Solution

Compounds containing double and triple bonds are known as unsaturated hydrocarbon. General formula for alkenes and alkynes are $$C_nH_{2n} \ and \ C_nH_{2n-2}$$. Both alkanes and alkynes can have single as well as multiple bonds in their structure.

Hence, option $$D$$ is correct.
Question 9
1 / -0

Acetic acid is:

A
methanoic acid

B
ethanoic acid

C
propanoic acid

D
none of these

Solution

Acetic acid is ethanoic acid with chemical formula as $$CH_3COOH$$. Its solution in water also called vinegar.
Question 10
1 / -0

Which of the following statements are correct?

A
Unsaturated hydrocarbons add hydrogen to give saturated hydrocarbons.

B
Catalysts are used for addition reactions of unsaturated hydrocarbons.

C
Hydrogenation of vegetable oils is an example of addition reaction.

D
All of the above

Solution

Unsaturated hydrocarbons add hydrogen in the presence of catalysts
to give saturated hydrocarbons. For example, the hydrogenation of vegetable oils is an example of addition reaction. In this reaction, the unsaturated hydrocarbons in vegetable oils are converted to saturated ones by adding hydrogen in presence of nickel catalyst.

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Carbon and its Compounds Test - 34

Result

Carbon and its Compounds Test - 34

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Question 1

single covalent bonds only.

at least one double bond.

at least one triple bond.

none of these

Solution

Question 2

89%

81%

79%

0%

Solution

Question 3

because it releases volatile pollutants

because it releases less pollutants

because it releases pollutants which are toxic

because it releases more pollutants

Solution

Question 4

petroleum products

coal and coke

plants and animals

none of the above

Solution

Question 5

Endothermically

Exothermically

Only some activation energy is required

Doesn't react

Solution

Question 6

Alkanes

Alkenes

Alkynes

Carbonyl compounds

Solution

Question 7

The ionic end of soap dissolves in water while the carbon chain dissolves in oil.

The ionic end of soap dissolves in oil while the carbon chain dissolves in water.

The ionic end of soap and the carbon chain both dissolve in water.

The ionic end of soap and the carbon chain both dissolve in oil.

Solution

Question 8

alkenes

alkynes

alkanes

both alkenes and alkynes

Solution

Question 9

methanoic acid

ethanoic acid

propanoic acid

none of these

Solution

Question 10

Unsaturated hydrocarbons add hydrogen to give saturated hydrocarbons.

Catalysts are used for addition reactions of unsaturated hydrocarbons.

Hydrogenation of vegetable oils is an example of addition reaction.

All of the above

Solution

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