What is the most abundant element in sea water?

Sodium

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Chlorine

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Iodine

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Potassium

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Solution

The correct option is C Chlorine
Salinity in seawater is mainly due to presence of sodium chloride. Abundant element in the seawater is chloride and constitutes 1.94% of all the constituents.
Chloride is followed by sodium which constitutes 1.08%, potassium 0.04% and minute quantities of iodine.

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