Combustion and Flame Test

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Combustion and Flame Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

The heat liberated per kilogram of a fuel is called its:

A
calorific value

B
mass value

C
weight value

D
fuel value

Solution

The total energy released as heat when a substance undergoes complete combustion with oxygen for a specific quantity is the calorific value. It is a measure of fuel efficiency. It is measured in kilojoule per kilogram ($$kJ/kg$$).
Question 2
1 / -0

Which compound is formed due to incomplete combination of fuels?

A
Carbon dioxide

B
Oxygen

C
Carbon monoxide

D
Water

Solution

Carbon monoxide gas is formed due to incomplete combustion of fuel.
Question 3
1 / -0

Which substance is not used as a fuel?

A
Ethanol

B
Hydrogen

C
Methane

D
Oxygen

Solution

A fuel is something that reacts with oxygen to give energy. Oxygen cannot react with itself so it is not possible.
Question 4
1 / -0

The hottest region in Bunsen flame shown in the figure given is:

A
Region 2

B
Region 3

C
Region 4

D
Region 1

Solution

$$\text{Region 1-}$$ Pre-heating zone
$$\text{Region 2-}$$ Primary combustion zone(Hottest region)
$$\text{Region 3-}$$ Internal zone
$$\text{Region 4-}$$ Secondary reaction zone
Primary combustion zone is the hottest region.
Question 5
1 / -0

Which of the following is not given out during complete combustion of fuel?

A
Heat

B
water

C
Carbon monoxide

D
Carbon dioxide

Solution

Carbon monoxide is produced when there is incomplete combustion of fuel takes place. Incomplete combustion occurs due insufficient amount of oxygen gas to produce carbon dioxide, heat, light, and water.
Hence, option $$C$$ is correct.
Question 6
1 / -0

In laboratory for burning, we use:

A
gobar gas

B
coal gas

C
oil gas

D
None of these

Solution

Coal gas is mainly used in coal-based industries and gobar gas is mainly used in the production of electricity.
In the laboratory for burning, oil gas is used. The commonly used cylinder or pipelines consists of oil gas.
Oil gas is a mixture of methane, carbon monoxide, hydrogen, carbon dioxide.
Question 7
1 / -0

$$CO_{2}$$ is a tasteless, colorless and

A
Non-combustible gas

B
Combustible gas

C
Flammable Gas

D
All of above

Solution

A. Non-combustible gas
Solution: Carbon Dioxide is a colorless, odorless, nontoxic, incombustible gas produced from the oxidation of carbon. It is heavier than air and may asphyxiate by the displacement of air. It is acidic in nature. Aqueous solution of carbon dioxide is known as carbonic acid. So the correct option is A.
Question 8
1 / -0

Which of the following are the characteristics of Indian coal?
$$1$$. High ash content
$$2$$. Low sulphur content
$$3$$. High sulphur content
Select the correct answer using the codes given.

A
$$1$$ and $$2$$ only

B
$$2$$ only

C
$$1$$ and $$3$$ only

D
$$1, 2$$ and $$3$$

Solution

Indian coal has high ash content and low sulphur content.
Therefore, statement 1 and 2 are correct.
Question 9
1 / -0

For complete combustion of a fuel, it will need:

A
high temperature

B
an excess of air

C
high air pressure

D
an excess of air and high temperature

Solution

Complete combustion is the combination of fuel with oxygen without fuel leftover requiring time, turbulence, and temperature high enough to ignite all the combustible elements. Here the temperature of a flame depends on the type of fuel, starvation or excess air, and initial temperatures of both fuel and air.
Hence the correct answer is an option (D).
Question 10
1 / -0

Which of the following happen when a wax candle is burnt

A
(i) and (ii) only

B
(ii) and (iii) only

C
(iii) and (i) only

D
(i), (ii) and (iii)

Solution

Wax is made up of carbon and hydrogen. When a candle burns the hydrogen and carbon from the wax combine with the oxygen in the air to become carbon dioxide and water vapor most of the matter from the candle ends up in the form of gases.
Hence the correct option is $$A$$.

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 31

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Combustion and Flame Test - 31

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Question 1

calorific value

mass value

weight value

fuel value

Solution

Question 2

Carbon dioxide

Oxygen

Carbon monoxide

Water

Solution

Question 3

Ethanol

Hydrogen

Methane

Oxygen

Solution

Question 4

Region 2

Region 3

Region 4

Region 1

Solution

Question 5

Heat

water

Carbon monoxide

Carbon dioxide

Solution

Question 6

gobar gas

coal gas

oil gas

None of these

Solution

Question 7

Non-combustible gas

Combustible gas

Flammable Gas

All of above

Solution

Question 8

$$1$$ and $$2$$ only

$$2$$ only

$$1$$ and $$3$$ only

$$1, 2$$ and $$3$$

Solution

Question 9

high temperature

an excess of air

high air pressure

an excess of air and high temperature

Solution

Question 10

(i) and (ii) only

(ii) and (iii) only

(iii) and (i) only

(i), (ii) and (iii)

Solution

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