Combustion and Flame Test

Result

Combustion and Flame Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

The lowest temperature at which a substance starts burning is called its:

A
minimum temperature

B
maximum temperature

C
boiling temperature

D
ignition temperature

Solution

The ignition temperature of a substance is the lowest temperature at which the substance starts burning.

$$\therefore$$ The correct option is $$D$$.
Question 2
1 / -0

In foam type fire extinguisher, _______ is responsible to put off fire.

A
$$H_2O$$

B
$$CO_2 + H_2O$$

C
$$CO_2$$

D
$$CO$$

Solution

In a foam type extinguisher, the chemical reaction that takes place produces carbon dioxide gas under pressure. The carbon dioxide gas forces itself out through the internal pipe of the nozzle. This carbon dioxide is responsible for putting off the fire.
Question 3
1 / -0

Which type of fire extinguisher is used to extinguish fire caused by burning oil and petrol?

A
Foam type

B
Water type

C
Soda acid type

D
$$CCl_4$$ type

Solution

A fire fighting foam is simply a stable mass of small air-filled bubbles, which have a lower density than oil, gasoline or water. The foam forms a cover over the oil, thus cutting off the oxygen supply and putting off the fire.
Question 4
1 / -0

Match column 'A' with column 'B', concerning the characteristics of a flame and its zones.
'A' 'B'
a. Dark inner zone 1. Hottest part (No carbon)
b. Blue zone 2. Partial combustion
c. Luminous zone 3. Unburnt vapours of wax
d. Non-luminous zone 4. Complete combustion

A
a -1, b - 2, c - 3, d - 4

B
a - 2, b - 3, c - 4, d - 1

C
a - 3, b - 4, c - 2, d - 1

D
a - 4, b - 1, c - 2, d - 3

Solution

1. Dark zone: The dark zone is the area around the wick of the candle flame that consists of unburnt wax vapour. It is the least hot of all the four zones.

2. Luminous zone: This part of the flame is the region where incomplete combustion takes place. This part of the candle flame has a yellowish flame.

3. Non-Luminous zone: The non-luminous zone is the region of complete combustion and also the hottest part of the flame.

4. Blue zone: This is due to the combustion of carbon monoxide, produced by the incomplete combustion of carbon particles in wax.
Question 5
1 / -0

All fuels undergo combustion. Identify the fuel which undergoes slow combustion on burning.

A
Wood

B
Kerosene

C
Petrol

D
Diesel

Solution

Three things are required in proper combustion before ignition can take place - heat, oxygen and fuel
$$\therefore$$ The correct option is $$A$$.
Question 6
1 / -0

Look at the given figures.
From the given figures, it is observed that the flame goes off on placing a lid over the flame. What inference can be made from the observation?

A
Nitrogen supports combustion

B
Oxygen is necessary for combustion

C
Carbon dioxide helps in combustion

D
All of the above

Solution
Question 7
1 / -0

Combustion is a ________ reaction accompanied by heat and light.

A
reduction

B
redox

C
substitution

D
oxidation

Solution

Combustion is a redox reaction that occurs when a substance combines with molecular oxygen to make oxygen-containing compounds of other elements in the reaction. It is accompanied by heat and light.
Hence, option B is correct.
Question 8
1 / -0

Why are the spirit and kerosene lamps made in such a way that the free end of the wicks with the flame remains totally cut off from the fuel?

A
Only (i) and (ii)

B
Only (ii) and (iii)

C
Only (i) and (iii)

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

Solution

The spirit and kerosene lamp are made such that the free end of the wick with flame totally remains totally cut from fuel because the fuel is vaporized at room temperature and is highly flammable. Hence option A is correct.
Question 9
1 / -0

Nitrogen dioxide reacts with water to give :

A
sulphuric acid

B
nitric acid

C
nitrogen

D
carbon dioxide

Solution

Nitrogen dioxide reacts with water forms nitric acid. In polluted areas, nitrogen dioxide is released which reacts with water vapour and forms nitric acid. The nitric acid formed comes down with rainwater and is called acid rain.
Question 10
1 / -0

Which one of the following is used as clean fuel?

A
Petrol

B
Mineral oil

C
Methane

D
LPG

Solution

Compared with some other fossil fuels, natural gas(LPG) emits the least amount of carbon dioxide into the air when combusted. It makes natural gas the cleanest burning fossil fuel of all.

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Re-Attempt Weekly Quiz Competition

'A'	'B'
a. Dark inner zone	1. Hottest part (No carbon)
b. Blue zone	2. Partial combustion
c. Luminous zone	3. Unburnt vapours of wax
d. Non-luminous zone	4. Complete combustion

Combustion and Flame Test - 32

Result

Combustion and Flame Test - 32

Score

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Rank

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SHARING IS CARING

Question 1

minimum temperature

maximum temperature

boiling temperature

ignition temperature

Solution

Question 2

$$H_2O$$

$$CO_2 + H_2O$$

$$CO_2$$

$$CO$$

Solution

Question 3

Foam type

Water type

Soda acid type

$$CCl_4$$ type

Solution

Question 4

a -1, b - 2, c - 3, d - 4

a - 2, b - 3, c - 4, d - 1

a - 3, b - 4, c - 2, d - 1

a - 4, b - 1, c - 2, d - 3

Solution

Question 5

Wood

Kerosene

Petrol

Diesel

Solution

Question 6

Nitrogen supports combustion

Oxygen is necessary for combustion

Carbon dioxide helps in combustion

All of the above

Solution

Question 7

reduction

redox

substitution

oxidation

Solution

Question 8

Only (i) and (ii)

Only (ii) and (iii)

Only (i) and (iii)

(i), (ii) and (iii)

Solution

Question 9

sulphuric acid

nitric acid

nitrogen

carbon dioxide

Solution

Question 10

Petrol

Mineral oil

Methane

LPG

Solution

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