Question

Which of the following is not an ore of magnesium?
(a) Carnallite
(b) Magnesite
(c) Dolomite
(d) Gypsum

Answer 1

Gypsum is not a ore of magnesium

hope it will help you

Answer 2

Answer: (d) Gypsum

Explanation:

Ore is the mineral from which metal is conveniently and economically extracted.

a) Carnalite is an ore of magnesium having molecular formula of $KMgCl_3·6H_2O$

b)  Magnesite is an ore of magnesium having molecular formula of $MgCO_3$

c) Dolomite is an ore of magnesium having molecular formula of $CaMg(CO_3)_2$

d) Gypsum is an ore of calcium having molecular formula of $CaSO_4·2H_2O$

Thus Gypsum is not an ore of magnesium.