Question 9

(a) ___ is a material that burns in the presence of oxygen to release carbon dioxide and a large amount of energy.

(b) Which among the given fuels would result in the least amount of residue on burning?

1. Coal

2. LPG

3. Petrol

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Solution

(a) Fuel is a material that burns in the presence of oxygen to release carbon dioxide and a large amount of energy.

(b) LPG

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The heat energy obtained on burning 2 kg of hydrogen, coal, and petrol are given below:

Hydrogen- $3 \times 10^{8}$ J

Coal- $6 \times 10^{7}$ J

Petrol- $9 \times 10^{7}$ J

Arrange these fuels in the ascending order of their calorific values.

Among the fuels like Wood, Coal, Petrol or Cooking gas, which of the following is a common substance that burns?

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