McqMate
| Q. |
Which metal is extracted from sea water? |
| A. | Potassium |
| B. | Magnesium |
| C. | Aluminium |
| D. | Beryllium |
| Answer» B. Magnesium | |
|
Explanation: The metal is now mainly obtained by electrolysis of magnesium salts obtained from brine. Commercially, the chief use for the metal is as an alloying agent to make aluminium- magnesium alloys, sometimes called "magnalium" or "magnelium". Since magnesium is less dense than aluminium, these alloys are prized for their relative lightness and strength. Magnesium is the fourth most common element in the Earth as a whole (behind iron, oxygen and silicon), making up 13% of the planet's mass and a large fraction of the planet's mantle. |
|
View all MCQs in
ChemistryNo comments yet