The salinity of sea water is

2.5

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3.5

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4.5

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5.5

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Solution

The correct option is B $3.5$ %
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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