The calorific values of petrol and CNG are 45000 kJ/kg and 50,000 kJ/kg, respectively. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why? [3 marks]

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Solution

CNG will be a preferred fuel to run the vehicle. [1 mark]

This is because the calorific value of CNG is higher than that of petrol. So, CNG will produce more energy on burning as compared to energy produced by burning equal quantity petrol. [1 mark]

Moreover, CNG is a cleaner fuel, so on combustion, it causes less air pollution than petrol. [1 mark]

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