State the full forms of LPG and CNG.
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The full forms of LPG and CNG are given below:
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Name two important processes supported by oxygen present in air.
Name the gas used in:
(a) weather balloons
(b) traffic lights
(c) electric bulbs
Define the following:
(a) Respiration
(b) Photosynthesis
(c) Combustion.
What are fuels? Give two examples of modern fuels.