Types of Combustion

Q.

What is meant by rapid combustion ? Give one example of rapid combustion.

Q. Incomplete combustion of methane forms –

1. $C{O}_2+H_{2}O$
2. $CO+H_{2}O$
3. $C{O}_2+H_2$
4. $CO+O_2$

Q.

What is meant by spontaneous combustion ? Give one example of spontaneous combustion.

Q.

What are the products of incomplete combustion?

Q.

Burning of the matchstick is an example of spontaneous combustion.

1. False
2. True

Q.

What is rapid combustion? Give an example. [2 MARKS]

Q.

What is meant by explosive combustion (or explosion) ? Give one example of explosive combustion or explosion).

Q.

Name one substance which undergoes spontaneous combustion (or burns in air at room temperature).

Q.

Write the combustion reaction of ethane.

Q. Which is the hottest part of a candle flame?

1. Outer flame
2. Inner flame
3. Middle flame
4. Wick

Q. Which of the following example(s) represents rapid combustion?

1. Burning of matchstick.
2. Burning of cooking gas.
3. Phosphorus burns in air at room temperature.
4. Ignition of a cracker.

Q.

The middle zone of a candle flame is also called the zone of ______ combustion.

1. complete

2. partial

3. rapid

4. spontaneous

Q.

Spontaneous combustion of coal dust has resulted in many disastrous fires in coal mines.

1. True

2. False

Q.

If ignition temperature of a substance is lower than room temperature then it will undergo spontaneous combustion.

1. True
2. False

Q.

Name any two conventional source of energy.

Q.

Fires in underground coal mines usually occur due to the :

(a) explosive combustion

(b) deliberate combustion

(c) spontaneous combustion

(d) rapid combustion

Q.

Combustion of fossil fuels in an insufficient supply of oxygen forms

1. Carbon dioxide

2. Oxygen

3. Nitrogen

4. Carbon monoxide

Q.

The combustion in which the gas burns rapidly and produces heat and light is known as__ combustion.

Q. Question 29
Cracker on ignition produces sound. Why?

Q.

What type of combustion is represented by :

(a) burning of white phosphorus in air at room temperature

(b) burning of LPG in a gas stove ?

(c) ignition of a cracker ?

(d) burning of coal dust in a coal mine ?

Q.

Which of the following undergoes spontaneous combustion ?

(a) yellow sulphur

(b) red phosphorus

(c) white phosphorus

(d) brown sulphur

Q.

Define the term fire triangle along with the components?

Q.

Incomplete combustion of coal and wood releases unburnt carbon particles.

1. False

2. True

Q.

Match the column
Directions: Match Column – I with Column – II and select the correct answer using the codes given below the columns

$\begin{array}{cc}Column-I& Column-II\\ \text{A. Hottest zone of candle flame}& \text{P. No combustion zone}\\ \text{B. Dark zone of candle flame}& \text{Q. Zone of unburnt wax vapours}\\ \text{C. Yellow zone of candle flame}& \text{R. Non-luminious zone}\\ \text{D. Black innermost zone of candle flame}& \text{S. Incomplete combustion zone}\end{array}$

1. $A\to P,B\to Q,C\to R,D\to S$

2. $A\to R,B\to P,C\to S,D\to Q$

3. $A\to S,B\to R,C\to Q,D\to P$

4. $A\to Q,B\to P,C\to R,D\to S$

Q.

Q17. What volume of air (containing$20\%$${\mathrm{O}}_2$ by volume) will be required to burn completely $10c{m}^3$each of methane and acetylene?

Q.

The fusion reactions occur at

1. Low pressures

2. High temperature

3. Extremely high temperature

4. High temperature and low pressure

Q.

Which of the following statements are true about Combustion.

1. it is a kind of chemical change

2. it requires carbon dioxide

3. it is a slow process

4. it releases heat as well as light energy.

Q.

An example of rapid combustion is :

1. Rusting of iron

2. Respiration

3. Rotting of wood

4. Burning of petrol

Q. Three substances P, Q and R are burnt. P burns quickly producing heat and light. Q burns at room temperature on its own. R burns and liberates alot of gases. What type of combustion does P, Q and R undergo?

1. P: Rapid combustion
   Q : Rapid combustion
   R : Explosion combustion
2. P: Spontaneous combustion
   R : Spontaneous combustion
   Q : Rapid combustion
3. P : Rapid combustion
   Q : Spontaneous combustion
   R : Explosion combustion
4. P: Spontaneous combustion
   Q : Rapid combustion
   R : Explosion combustion

Q.

Arrange the different regions of a flame in increasing order of temperature.

1. Middle region < inner region < outermost region

2. Inner region < middle region < outermost region

3. Inner region < outermost region < middle region

4. Outermost region < inner region < middle region​