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Question

The salinity of sea water is
  1. 2.5%
  2. 3.5%
  3. 4.5%
  4. 5.5%

A
2.5%
B
4.5%
C
3.5%
D
5.5%
Solution
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Sea water has a salinity of 3.5% i.e. the sea water contain about 35 grams of dissolved salt per kg of water ( about 1 litre of water ). This salinity is because of the rivers that carry chemical/salts dissolved out of rocks and soil. NaCl makes the most of this dissolved salt.
So, the answer is option B

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