Give Scientific reason: Why do some metals form metal Oxides while other form metal hydroxides? Give one example for each.

2. Explain the phenomenon of Sacrificial Protection of metal from

water?

3. Complete the following:

a-Aluminum gives a protective layer (from corrosion) by

forming

b-Zinc gives protective layer by forming

3. Write the uses of gold, silver, and copper due to their least reactivity.