Unburnt Carbon Particles

Q.

Which of the following is a combustion reaction?

1. Melting of wax

2. Burning of petrol

3. Boiling of water

4. Freezing of Ice

Q. Why CNG called a clean fuel

Q.

Incomplete combustion of coal and petroleum : (A) increases air pollution. (B) increases efficiency of machines. (C) reduces global warming. (D) produce poisonous gases. The correct option is ?

1. (A) and (B)

2. (A) and (D)

3. (B) and (C)

4. (C) and (D)

Q. Which of the following statement regarding combustion of fuel is true?

1. Carbon-dioxide is formed during complete combustion.
2. Soot is formed during partial combustion of coal.
3. Rate of combustion decreases if supply of oxygen is more.
4. Fuels burn with the help of oxygen.

Q. Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.​

Q. What happens when coal is burnt incomplete?

Q.

Incomplete combustion of carbon based fuels like coal, wood causes -

1. Respiratory Diseases

2. Asthama

3. Eye Diseases

4. Both Respiratory diseases and asthama.

Q. Arrange the following in the decreasing order of greenhouse gas emissions.

1. LNG
2. CNG
3. Coal
4. Diesel
5. Petrol

Q.

Incomplete combustion of carbon based fuels like coal, wood causes:

1. Respiratory Diseases

2. Asthama

3. Eye Diseases

4. Both Respiratory diseases and asthama.

Q. What is the unburnt material that is present in a fuel, e.g. wood?

1. Ash
2. Coal
3. Coke
4. Carbon

Q. Question 3
Explain how the use of CNG in automobiles has reduced pollution in our cities.

Q.

Incomplete combustion of coal and wood releases unburnt carbon particles.

1. True

2. False

Q. Why is CNG a cleaner fuel?

1. No particulate emission
2. Releases very less amounts of sulphur and nitrogen oxides
3. No emission of ash
4. All of the above

Q.

Cotton or natural Cellulose burns with smoke and leaves a residue.

1. True

2. False

Q.

Fuels like coal, petrol, diesel and natural gas are burnt, ___________ gas is released in large volumes.

1. carbon dioxide

2. nitrogen

3. Hydrogen

4. Oxygen

Q.

Fill in the blanks :

1. Burning of wood and coal causes ………. of air.

2. A liquid fuel, used in homes is ……….

3. Fuel must be heated to its ……….. before it starts burning.

4. Fire produced by oil cannot be controlled by ……………

Q.

The fine black particles, chiefly composed of carbon, produced by incomplete Burning is ___________.

1. Wick

2. Blue zone

3. Non-luminous zone

4. At the tip of the flame

Q. The following pictures relate to burning of ________ fuels.

1. 
2. 
3. 
4. 

Q.

Incomplete combustion of coal and wood releases unburnt carbon particles.

1. True

2. False

Q.

Fill in the blanks :

1. Burning of wood and coal causes ………. of air.

2. A liquid fuel, used in homes is ……….

3. Fuel must be heated to its ……….. before it starts burning.

4. Fire produced by oil cannot be controlled by ……………

Q.

18. Incomplete combustion of fuels does not contribute

1. photochemical smog

2. acid rain

3. global warming

4. Both (A) and (B)

Q. Charcoal burn to produce heat, light and:

1. $C{O}_2$
2. $O_2$
3. $H_2$
4. Both B and c

Q.

Incomplete combustion of coal and wood releases unburnt carbon particles.

1. False

2. True

Q.

Incomplete combustion of carbon based fuels like coal, wood causes -

1. Cardiac arrest

2. Asthma

3. Respiratory diseases

4. Both respiratory diseases and asthma

Q. The following pictures relate to burning of ________ fuels.

1. 
2. 
3. 
4. 

Q.

What are fine black particles, chiefly composed of carbon, produced by incomplete combustion of coal, oil, wood, or other fuels called?

1. Soot

2. Fume

3. Fog

4. Smog

Q. The following pictures relate to burning of ________ fuels.

1. 
2. 
3. 
4. 

Q.

What are fine black particles, chiefly composed of carbon, produced by incomplete combustion of coal, oil, wood, or other fuels called?

1. Soot

2. Fume

3. Fog

4. Smog

Q.

The solid residue obtained on the destructive distillation of wood is known as ___.

1. Chartile

2. Charcoal

3. Carbonia

4. Carbon Plank

Q.

Incomplete combustion of carbon based fuels like coal, wood causes -

1. Respiratory Diseases

2. Asthama

3. Eye Diseases

4. Both Respiratory diseases and asthama.