(a)(i) Distinguish between a strong acid and a concentrated acid. (ii) What is meant by amphoteric oxide? Give one example. (b)(i) Describe the manufacture ...

(a)(i) Distinguish between a strong acid and a concentrated acid.

(ii) What is meant by amphoteric oxide? Give one example.

(b)(i) Describe the manufacture of tetraoxosulphate (VI) acid by contact process.

(ii) Write one equation each to show the action of tetraoxosulphate (VI) acid respectively as a dehydrating agent and as an oxidizing agent.

(iii) Give the reason why tetraoxosulphate classified as a heavy chemical.