Q47 of 141 Page 14

Name three characteristics of a fuel that determines its quality.

The three characteristics of a fuel that determines its quality are:
(i) It should burn easily.
(ii) It should cause least pollution in air.
(iii) It should be easy to store and should not produce any hazards during transportation.

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45 Name any two components obtained by fractional distillation of petroleum that are not used as a fuel. 46 Write the full name for LPG and CNG. 48 The heat produced by burning of cow dung cake of mass 210 g raised the temperature of 50 g of water by 2° C. Assuming that all the heat was utilized for heating water whose specific heat capacity is 4.2 J/g ° C, calculate the calorific value of the dung cake. 49 Explain why is it difficult to burn a wet piece of wood.