Multiple choice

Which of the following sequence correctly represents the percentage of given salts in sea water in decreasing order?

  1. Magnesium chloride - Sodium chloride - Magnesium sulphate - Calcium sulphate

  2. Magnesium sulphate - Magnesium chloride - Calcium sulphate - Sodium chloride

  3. Sodium chloride - Magnesium chloride - Magnesium sulphate - Calcium sulphate

  4. Sodium chloride - Magnesium sulphate - Magnesium chloride - Calcium sulphate
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C Correct answer
Explanation

Sea water contains various dissolved salts, with sodium chloride (NaCl) being the most abundant at about 77.8%, followed by magnesium chloride (MgCl2) at about 10.9%, magnesium sulphate (MgSO4) at about 1.2%, and calcium sulphate (CaSO4) at about 0.3%. The decreasing order correctly represents their relative abundance in ocean water.

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