a. Describe how iron and aluminum reacts with each of the following substances: i.  dilute \(H_2SO_4\); ii.   dilute \(HNO_3\)

bi. Write an equation for the burning of sulphur in air.

ii. Name the catalyst used in the contact process.

iii. In the contact process, why is an excess of air used?

iv. Why is it necessary to cool the catalyst used in 5(b)(ii)?

v. Give a reason why the air used in the contact process needs to be as clean as possible.

vi. State two reasons why SO2 should not be discharged into the atmosphere.

ci. State the reagents and conditions used in the laboratory preparation of chlorine.

ii. State two uses of chlorine.

di. Name the drying agents for each of the following gases: 1. Hydrogen; 

i2.  sulphur (IV) oxide; 

i3. Ammonia.

ii1. State the components of the following
      Bronze;  ii2. Brass.