Chemistry
The purest form of natural water is :
- sea water
- rain water
- river water
- spring water
Water
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Answer
rain water
Reason — Rainwater is the purest form of natural water. It is formed naturally by evapouration followed by condensation of water vapour in the atmosphere.
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The ratio of hydrogen and oxygen by mass in a molecule of water is :
- 1:16
- 2:8
- 1:8
- 8:1
Sea water contains a large amount of:
- suspended impurities
- disolved common salt
- oily substances
- none of the above
Water retuns on earth's surface from the atmosphere by the process of:
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- respiration
- photosynthesis
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Spring water is classified as:
- surface water
- above surface water
- underground water
- none of these