There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has:

(a) more of carbon but less of hydrogen
(b) less of carbon but more of hydrogen
(c) equal proportions of carbon and hydrogen
(d) less of carbon as well as less of hydrogen

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Solution

(b) less of carbon but more of hydrogen gas

The fuel with the highest calorific value would have less carbon and more hydrogen, because hydrogen has a higher calorific value than carbon.

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^{'} A^{'}

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There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has: (a) more of carbon but less of hydrogen (b) less of carbon but more of hydrogen (c) equal proportions of carbon and hydrogen (d) less of carbon as well as less of hydrogen

(b) less of carbon but more of hydrogen gas The fuel with the highest calorific value would have less carbon and more hydrogen, because hydrogen has a higher calorific value than carbon.

(b) less of carbon but more of hydrogen gas

The fuel with the highest calorific value would have less carbon and more hydrogen, because hydrogen has a higher calorific value than carbon.