Which of the following is/are examples of Oxidation and Reduction reactions?
1. Hydrogenation of vegetable oil.
2. Corrosion of metals.
3. Souring of milk.
Choose the correct answer using the codes given below:
1
1 and 2 only
2
1 and 3 only
3
2 and 3 only
4
1, 2 and 3