Q29 of 269 Page 122

Which of the following is not a fossil fuel?

This is because Biogas isn't prepared from the remains of plants and animals whereas fossils fuels are prepared from the remains of plants and animals.

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27

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

 28

One of the following is not a characteristic of a good fuel. This is:

 30

The calorific values of three fuels A, B and C are 33 KJ/g, 150 KJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. On combustion, both A and B produces carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.

 31

Calorific value and ignition temperature of fuel X are 75 kJ/g and 200C respectively. These values for fuel Y are 50 kJ/g and 750C respectively. On burning, the fuel Y produces only CO2 while fuel X produces CO2 and CO. Which of the two is a better fuel? Give two reasons to support your answer.