Combustion and Flame Test

Result

Combustion and Flame Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is a supporter of combustion?

A
Cooking gas

B
Nitrogen gas

C
Oxygen gas

D
Producer gas

Solution

Oxygen gas supports the combustion of fuels. For example, cooking gas and producer gas are fuels that burn in the presence of oxygen gas. They will not burn in its absence. Nitrogen is a non-flammable gas.
Question 2
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Which of the following changes is not a physical change?

A
Glowing of filament in bulb

B
Combustion

C
Boiling of water

D
Sublimation

Solution

Combustion represents a chemical reaction whereby the carbon compounds are converted into different chemicals like carbon dioxide and water vapor in presence of oxygen. So this is a chemical change.

The other options are physical changes as there is no change in the chemical composition of the substances in these processes.
Question 3
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The lowest temperature at which a combustible substance catches fire is called:

A
critical temperature

B
absolute temperature

C
ignition temperature

D
none of these

Solution

Ignition temperature is the lowest temperature at which a combustible substance catches fire.
The lowest temperature at which a combustible substance when heated takes fire in the air and continues to burn also called autogenous ignition temperature.
Hence, option C is correct.
Question 4
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When magnesium ribbon burnt it produce:

A
Magnesium hydroxide

B
Magnesium oxide

C
Magnesium chloride

D
Magnesium sulphate

Solution

When magnesium ribbon burns, it reacts with the oxygen present in the air and form a powdery ash called magnesium oxide.
$$2Mg+O_2\rightarrow 2MgO$$.
Hence option B is correct.
Question 5
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Which of the following is combustible?

A
Oxygen

B
Carbon dioxide

C
Hydrogen

D
All of the above

Solution

Hydrogen is very combustible because it is very reactive. It can easily combine with an oxidizer to be oxidized. In fact, hydrogen can be oxidized or reduced and can combine with every element except noble gases.
Question 6
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Which of the following has lower ignition temperature?

A
Wood

B
Paper

C
Vegetable oil

D
Kerosene oil

Solution

Kerosene oil has lower ignition temperature is highly flammable and easily catches fire very quickly.
Question 7
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Combustion of most fuels releases:

A
$$CO_2$$

B
$$SO_2$$

C
$$NO_2$$

D
$$O_2$$

Solution

Fuels are mainly composed of carbon. Fuel burn when they react with oxygen which is present in air to form carbon dioxide.

$$C + O_2 \rightarrow CO_2$$
Question 8
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Ideal fuel has a __________ calorific value.

A
low

B
high

C
moderate

D
zero

Solution

Ideal fuel has high calorific value. This ensures that more amount of heat energy is released from the combustion of unit mass of fuel. In other words, a fuel with high calorific value is better than a fuel having low calorific value.
Question 9
1 / -0

How individuals can help to prevent acid rains?

A
By using public transportation

B
Using the electrical energy efficiently

C
Simply walking wherever possible

D
All

Solution

All the above activities result in the less use of fossil fuels, and hence less release of acid rain causing oxides.

Hence the correct option is D.
Question 10
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What is the factor that differentiates between combustion and burning?

A
Amount of oxygen used

B
Environment

C
Material

D
None of the above

Solution

They are different with respect to the combustion is done in a fixed amount of oxygen while in burning it has the access of infinite amount of oxygen (done in open).
Hence option (A) is correct.

Hence, the correct option is $$A$$

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 22

Result

Combustion and Flame Test - 22

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SHARING IS CARING

Question 1

Cooking gas

Nitrogen gas

Oxygen gas

Producer gas

Solution

Question 2

Glowing of filament in bulb

Combustion

Boiling of water

Sublimation

Solution

Question 3

critical temperature

absolute temperature

ignition temperature

none of these

Solution

Question 4

Magnesium hydroxide

Magnesium oxide

Magnesium chloride

Magnesium sulphate

Solution

Question 5

Oxygen

Carbon dioxide

Hydrogen

All of the above

Solution

Question 6

Wood

Paper

Vegetable oil

Kerosene oil

Solution

Question 7

$$CO_2$$

$$SO_2$$

$$NO_2$$

$$O_2$$

Solution

Question 8

low

high

moderate

zero

Solution

Question 9

By using public transportation

Using the electrical energy efficiently

Simply walking wherever possible

All

Solution

Question 10

Amount of oxygen used

Environment

Material

None of the above

Solution

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