Extraction of Magnesium

Q. Write chemical formulae of the sulphates of Aluminium, Ammonium and Zinc.

Q.

Which of the following ore contains both magnesium and calcium

1. Magnesite

2. Dolomite

3. Carnellite

4. Phosphorite

Q.

$Mg+H_{2}S{O}_4\to \underset{–}{A}+H_2\left(Mg\right)\left(dilute\right)$

$Mg+2H_{2}S{O}_4\to \underset{–}{A}+\underset{–}{B}+2H_{2}O.\left(Concentrated\right)$ A & B are

1. MgSO₄, SO₃

2. MgO, SO₃

3. MgSO₄, SO₂

4. MgO, SO₂

Q. What is the chemical formula for:
1. Zinc sulphide
2. Aluminium carbide
3. Iron pyrites
4. Sodium meta aluminate

Q.

Metallic magnesium is prepared by

1. Reduction of MgO by coke

2. Reduction of MgO by coke

3. Displacement of Mg by iron from $MgS{O}_4$ solution

4. Electrolysis of molten $MgC{l}_2$

Q.

The metal that is extracted from sea water is

1. Ba

2. Mg

3. Ca

4. Sr