Combustion and Flame Test

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Combustion and Flame Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following has the characteristics of a good fuel?

A
Coke

B
Butane

C
Coal

D
Kerosene

Solution

A good fuel must be readily available, a good conductor of heat energy, easy to store, inexpensive and must not produce any toxic gases. Butane is a good fuel as compared to others as it does not leave any residue on burning or does not gives out any smoke.
Question 2
1 / -0

The blue zone in an LPG flame indicates:

A
no combustion

B
partial combustion

C
complete combustion

D
none of the above

Solution

Flame colour helps in determining the changes taking place in the particular region of the flame. In the blue zone, complete combustion of fuel takes place. So, the amount of soot decreases, and the temperature is highest.
Hence, the correct option is C.
Question 3
1 / -0

In soda-acid fire extinguisher, _______ helps in putting out the fire.

A
$$CO_2$$

B
$$CO_2 + H_2O$$

C
$$H_2O$$

D
$$H_2O + H_2$$

Solution

Fire extinguishing is done by the carbon dioxide that is produced when the acid reacts with baking soda in the extinguisher.

$$2NaHCO_3 + H_2SO_4 \rightarrow Na_2SO_4 + 2CO_2 + 2H_2O$$
Question 4
1 / -0

Water cannot be used as fire extinguisher to put out_________.

A
burning wood

B
burning oil

C
burning cloth

D
burning charcoal

Solution

Water cannot be used as fire extinguisher to put out burning oils like petrol, diesel, etc. Oil is lighter than water and so it floats over it and continues to burn. Moreover, the water can spread and carry the oil with it, thus extending the fire over more area.
Question 5
1 / -0

The conditions necessary for combustion are ___________.

A
presence of combustible substance

B
presence of supporter of combustion

C
attainment of ignition temperature

D
all of these

Solution

Combustion is a chemical reaction in which a combustible or flammable substance reacts with a gas (which is a supporter of combustion, for example oxygen), releasing heat. The reaction is exothermic in nature. Necessary factors required for a combustion reaction to take place are:
1. A combustible or flammable substance. For example wood, petroleum, etc.
2. Ignition temperature. The fuel must be at or above this 'ignition temperature'.
3. A gas that is a supporter of combustion (oxygen). An abundant supply of such a gas is required.
Question 6
1 / -0

The type of combustion in which heat, light and sound are produced is:

A
rapid

B
explosive

C
spontaneous

D
none of these

Solution

A very fast combustion reaction in which a large amount of heat, light, and sound is produced is called explosive combustion.
Question 7
1 / -0

Which of the following statement is not true?

A
Flame can be seen over burning solids and liquids

B
Type of flame depends upon the amount of oxygen available

C
Invisible zone of a flame is the least hot zone

D
Blue zone indicates complete combustion of fuel

Solution

The invisible zone of the flame is also called a non-luminous zone which is the zone of complete combustion. Due to complete combustion, the zone becomes the hottest zone of the flame. Hence option C is correct.
Question 8
1 / -0

Type of flame produced by a fuel depends upon _________.

A
calorific value

B
amount of oxygen

C
type of fuel and its chemical composition

D
all of the above

Solution

The type of flame produced when fuels burn is based on the amount of oxygen available to the burning fuel.
Hence, option $$B$$ is correct.
Question 9
1 / -0

Incomplete combustion of a fuel gives _____________.

A
$$CO$$

B
$$CO_2$$

C
$$SO_2$$

D
oxides of nitrogen

Solution

Incomplete combustion represent the process in which fuel is partially burned due to which it causes removal of carbon monoxide gas.
Question 10
1 / -0

Apurva covered a burning candle with a glass. What'll happen to the burning candle?

A
It will extinguish immediately.

B
It will burn for some time before being cut off.

C
It will continue burning.

D
Candle will melt.

Solution

Fire is a chemical reaction that creates light and heat from oxygen and fuel. A lit candle needs to draw oxygen from the air in order to continue burning. If you limit the amount of air available, the candle's flame eventually goes out once it uses up all the oxygen and candle will burn for some time before being cut off.

Hence, the correct option is $$\text{B}$$

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 18

Result

Combustion and Flame Test - 18

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SHARING IS CARING

Question 1

Coke

Butane

Coal

Kerosene

Solution

Question 2

no combustion

partial combustion

complete combustion

none of the above

Solution

Question 3

$$CO_2$$

$$CO_2 + H_2O$$

$$H_2O$$

$$H_2O + H_2$$

Solution

Question 4

burning wood

burning oil

burning cloth

burning charcoal

Solution

Question 5

presence of combustible substance

presence of supporter of combustion

attainment of ignition temperature

all of these

Solution

Question 6

rapid

explosive

spontaneous

none of these

Solution

Question 7

Flame can be seen over burning solids and liquids

Type of flame depends upon the amount of oxygen available

Invisible zone of a flame is the least hot zone

Blue zone indicates complete combustion of fuel

Solution

Question 8

calorific value

amount of oxygen

type of fuel and its chemical composition

all of the above

Solution

Question 9

$$CO$$

$$CO_2$$

$$SO_2$$

oxides of nitrogen

Solution

Question 10

It will extinguish immediately.

It will burn for some time before being cut off.

It will continue burning.

Candle will melt.

Solution

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