Q38 of 269 Page 132

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

Fossil fuels are obtained from remains of animals and plants under the earth over a period of millions of years these existed and grew due to sun's energy thus the ultimate source of fossil fuels can be considered to be the sun's energy.


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Fossil fuels are energy rich compounds of an element X which were originally made by the plants with the help of sun’s energy.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

 39

A substance X is added to LPG cylinders while filling so as to make the detection of leakage of LPG from the cylinders easy.

(a) Name the substance X


(b) How does substance X make the detection of leakage of LPG easy?

 40

The pollution of air caused by burning petroleum fuels (like petrol and diesel) in vehicles can be controlled by fitting a device X in the exhaust system of vehicles.

(a) Name the device X


(b) How does this device help in controlling air pollution ?