Extraction of Magnesium

Q.

Which of the following ore contains both magnesium and calcium

1. Magnesite

2. Dolomite

3. Phosphorite

4. Carnellite

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. To prevent magnesium from oxidation in electrolytic extraction process

1. Some calcium fluoride is added

2. The whole process is done in an atmosphere of coal gas

3. Some chlorides are added

4. Metal is taken out by spoons

Q.

The metal that is extracted from sea water is

1. Ca

2. Mg

3. Sr

4. Ba

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. MgO, SO₂

4. MgSO₄, SO₂

Q. Which of the following statement is incorrect regarding Magnesium?

1. Mg is used in flash powders and bulbs, incendiary bombs and signals.
2. Mg-Al alloys being light in mass are used in air-craft construction.
3. None of the above
4. Magnesium cannot form alloys with aluminium or zinc but it forms alloys with manganese and tin.

Q. Choose the correct statement(s) regarding Magnesium :

1. Magnesium forms alloys with aluminium, zinc, manganese and tin.
2. Mg-Al alloys being light in mass are used in air-craft construction.
   
3. Mg is used in flash powders and bulbs, incendiary bombs and signals.
4. Milk of magnesia is used as antacid in medicine.

Q.

The metal that is extracted from sea water is

1. Ba

2. Mg

3. Ca

4. Sr

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.

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 $MgC{l}_2$