Fuels, Combustion and Flame Worksheet-1

Fuels, Combustion and Flame Worksheet-1

1. Read the given statements and select the correct option.

Statement 1: Combustion is a chemical process in which a substance reacts with oxygen to give off heat and at times light.

Statement 2: Heat and light produced in sun are due to combustion.

(a) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1

(b) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1

(c) Statement 1 is true and statement 2 is false

(d) Both statements 1 and 2 are false

2. Read the given statements and select the correct option.

Statement 1: Phosphorus burns in air at room temperature.

Statement 2: It is an example of rapid combustion.

(a) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1

(b) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1

(c) Statement 1 is true and statement 2 is false

(d) Both statements 1 and 2 are false

Fill in the blanks.

3. The minimum temperature at which a substance burns in the air is called _______.

4. The catalyst in the decomposition of hydrogen peroxide is ________.

5. Dust particles from air are removed by passing air through _____ or _______.

6. When ammonia gas is burnt in the excess of oxygen at high temperature, the products formed are _______.

7. Thermosphere is associated with high temperature due to absorption of _______.

Answer Key:

1. C
2. B
3. Ignition Temperature
4. MnO₂
5. precipitators, filters,
6. NO, H₂O
7. Intense solar radiation