Combustion and Flame Test

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Combustion and Flame Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is a combustion reaction?

A
Boiling of water

B
Melting of wax

C
Burning of petrol

D
None of these

Solution

Combustion reactions always involve molecular oxygen $$O_2$$. Anytime anything burns (in the usual sense), it is a combustion reaction. Combustion reactions are almost always exothermic (i.e., they give off heat). For example: When wood burns, it must do so in the presence of $$O_2$$ and a lot of heat is produced.
Question 2
1 / -0

The zone of no combustion is _______.

A
The middle zone

B
Outermost zone

C
The base of the flame

D
Innermost zone

Solution

Innermost zone is the zone of no combustion. It is also called as dark zone which is formed around the wick of the candle flame.
Question 3
1 / -0

Burning of coal and wood causes _____________.

A
pollution of air

B
decrease of non-renewable source of energy

C
Both A and B

D
Neither A nor B

Solution

Burning of coal and wood causes air pollution and because of burning of coal and wood there is decrease in amount of non-renewable sources.
Question 4
1 / -0

The substance which is expected to have the highest ignition temperature out of the following is _________.

A
coal

B
kerosene

C
petrol

D
alcohol

Solution

Ignition temperature of a substance is the least temperature at which the substance starts combustion. We all know coal requires more temperature to start burning or to start combustion.

Substances Ignition temperatures (in Celsius)
Coal 580
Kerosene 295
Petrol 400
Alcohol 365
Hence the highest ignition temperature is of coal.
Question 5
1 / -0

Combustion is a:

A
physical process

B
chemical process

C
biological process

D
mechanical process

Solution

The chemical mechanism of their combustion is not yet clear, probably because oxidation of carbon monoxide, a reaction that is part of the combustion of practically all-natural fuels, usually occurs in the presence of hydrogen or hydrogen compounds.

Hence, combustion is a chemical process.
Question 6
1 / -0

The non-combustible substance among the following is ______.

A
Coal

B
Glass

C
Wood

D
Paper

Solution

Glass is the non-combustible substance among the given options.
Question 7
1 / -0

The difference between combustible over non-combustible substances is:

A
it cannot ignite

B
it can ignite

C
need low activation energy

D
need high activation energy

Solution

Combustible substances:- Substances which burn in air to produce heat and light are called combustible substances. Eg:- wood, coal, charcoal, kerosene, petrol, diesel, liquefied petroleum gas (LPG), compressed natural gas (CNG) etc.

Non-Combustible substances:- Substances like stone, glass, iron nails, etc. do not burn on being exposed to flame.
Question 8
1 / -0

Magnesium is a _______________metal.

A
non-combustible

B
combustible

C
non

D
None of the above

Solution

Magnesium is a combustible metal.

It burns to form magnesium oxide and produces heat and light.

Hence the correct option is B.
Question 9
1 / -0

Combustion is a process involving:

A
oxidation

B
reduction

C
liberation of heat

D
all of the above

Solution

Combustion is a process involving oxidation, reduction and liberation of heat.
Question 10
1 / -0

The component of air which controls combustion is __________.

A
Water vapour

B
Oxygen

C
Nitrogen

D
Carbon monoxide

Solution

Combustion is a chemical process in which substance reacts rapidly with oxygen and gives off heat. The original substance is fuel and the oxygen source is oxidizer. Oxygen is essentially required to carry the process of combustion.

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 10

Result

Combustion and Flame Test - 10

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SHARING IS CARING

Question 1

Boiling of water

Melting of wax

Burning of petrol

None of these

Solution

Question 2

The middle zone

Outermost zone

The base of the flame

Innermost zone

Solution

Question 3

pollution of air

decrease of non-renewable source of energy

Both A and B

Neither A nor B

Solution

Question 4

coal

kerosene

petrol

alcohol

Solution

Question 5

physical process

chemical process

biological process

mechanical process

Solution

Question 6

Coal

Glass

Wood

Paper

Solution

Question 7

it cannot ignite

it can ignite

need low activation energy

need high activation energy

Solution

Question 8

non-combustible

combustible

non

None of the above

Solution

Question 9

oxidation

reduction

liberation of heat

all of the above

Solution

Question 10

Water vapour

Oxygen

Nitrogen

Carbon monoxide

Solution

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