Q35 of 269 Page 131

Coal is more valuable when used:

As charcoal do not produces smoke while burning and has a low ignition temperature and high calorific value.

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33

LPG consists mainly of:

 34

Coke is more valuable when used

 36

One of the following does not contribute to acid rain. That is:

 37

Fossil fuels are energy rich compounds of an element X which were originally made by the plants with the help of sun’s energy.

(a) Name the element X


(b) Name another element which is usually found in combination with X in fossil fuels.