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Q. Which among the following salts has the highest percentage in ocean water?
Answer: Sodium Chloride
Notes: The average salinity varies 33% – 37% in different oceans and seas.
SALTS PERCENTAGE (%) :
Sodium Chloride -  77.8
Magnesium Chloride - 10.9
Calcium Sulphate - 3.6
Calcium Carbonate - 0.3

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Question Number: 42 in Oceanography - Ocean Temperature, Density, Salinity in above course in App.