Q36 of 269 Page 131

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

Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH).

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34

Coke is more valuable when used

 35

Coal is more valuable when used:

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Fossil fuels are energy rich compounds of an element X which were originally made by the plants with the help of sun’s energy.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

 38

The energy in petrol originally came from the Sun. Explain how it got into petrol.