Extraction of Calcium

Q.

Calcium is obtained by

1. Roasting of limestone

2. Electrolysis of molten $CaC{l}_2$

3. Electrolysis of solution of $CaC{l}_2$ in water

4. Reduction of $CaC{l}_2$ with carbon

Q. The charcoal used to obtain magnesium from its oxide is:

1. Sugar charcoal
2. Bone charcoal
3. Wood charcoal
4. Activated charcoal

Q.

$Ca+O\to \underset{–}{A}$

$Ca+N_2\to \underset{–}{B}$. A & B are

1. CaO₂, Ca₃N₂

2. CaO, CaN₃

3. CaO, Ca₃ N₂

4. CaO, CaN₂