Combustion

Q.

Compare LPG and wood as fuels. [6 Marks]

Q.

Air has to be blown around coal for it's easy combustion.

1. True

2. False

Q.

What is the source of the sun's heat and light energy?

1. Explosion

2. Super fuel

3. Nuclear reactions

4. Both explosion and nuclear reaction.

Q.

Identify the appropriate category in which combustion can be categorised.

1. Physical change

2. Chemical change

3. Cyclic change

4. All the above options are correct.

Q. Incomplete combustion of fuel produces which gas/gases?

1. $CO$
2. $C{O}_2$
3. $S{O}_2$
4. All

Q. On complete combustion of methane, we get a material that is

1. Acidic
2. Neutral
3. Basic
4. Solid

Q. Combustion is ___ reaction accompanied by light.

1. an exothermic
2. a substitution
3. an endothermic
4. an elimination

Q. In __________ combustion, a substance suddenly starts burning without any external cause.

1. slow
2. non-spontaneous
3. spontaneous
4. rapid

Q.

The rapid oxidation of a material to give off energy in the form of heat and light is known as -

1. Condensation

2. Combustion

3. Coalition

4. Corrosion

Q.

During combustion of coal, the supporter of combustion is :-

1. Nitrogen

2. Oxygen

3. Carbon dioxide

4. Carbon monoxide