Question

Magnesium constitutes around __________ of ocean water in weight.

(a) 1.2%

(b) 23%

(c) 0.125%

(d) 7.4%

This question was addressed to me in unit test.

This key question is from Magnesium and its Alloys-2 in chapter Magnesium Alloys of Aerospace Materials & Processes

Answer 1

Correct option is (c) 0.125%

To explain I would say: Magnesium is found in several parts of the world as ores. It is also present in water bodies. Magnesium constitutes around 0.125% of ocean water. The slat lake city of Utah, U.S.A contains 0.56% magnesium.