Question

4. Which of the following is a characteristic of an ideal fuel?
a. High calorific value
b. High rate of combustion
c. Low ignition temperature
d. Should cause pollution
5. Which of the following is the main constituent of natural gas?
a. Oxygen b. Petrol
C. Methane
d. Carbon dioxide
6. Which of the following is an air pollutant?
a. Carbon monoxide
b. Oxides of nitrogen and sulphur
C. Soot particles
d. All of these​

Answer 1

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4. Which of the following is a characteristic of an ideal fuel?

$\sf\red{Answer:-}$High Calorific Value

5. Which of the following is the main constituent of natural gas?

$\sf\red{Answer:-}$Methane

6. Which of the following is an air pollutant?

$\sf\red{Answer:-}$Carbon Monoxide

Answer 2

4,high rate of combustion (b)

5,methane(c)

7,all of the above(d)

hope it's helpful friend ☺☺