Identify the correct setup in the following experiment.

Assertion (A): The process of electrolysis is a redox reaction.

Reason (R): Reduction occurs at anode and oxidation at cathode.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

The hydroxide soluble in excess of sodium hydroxide solution but not in excess of ammonium hydroxide solution is:

1. Calcium hydroxide
2. Lead hydroxide
3. Magnesium hydroxide
4. Ferrous hydroxide

The common name of the ore of iron is:

1. Haematite
2. Calamine
3. Cryolite
4. Hydrated aluminum oxide