Metallic oxide of zinc, magnesium and copper were heated with following metals :

In which case will you find displacement reactions taking place?

Which metals do not corrode easily?

Which of the following pairs will give displacement reactions?

1. NaCl solution and copper metal
2. MgCl₂ solution and aluminium metal
3. FeSO₄ solution and silver metal
4. AgNO₃ solution and copper metal.

Which of the following methods is suitable for preventing an iron frying pan from rusting?

1. Applying grease
2. Applying paint
3. Applying a coating of zinc
4. All of the above