I. 8(a) What are alloys and how are they produced industrially? (b) Explain why alloys are usually used in preference over the pure metals. (c) Give the composition and uses of the following: (a ( (i) bronze (ii) brass (iii) duralumin (iv) type metal (v) soft solder. (d) Which of the following metals belong(s) to the first transition series? Chromium, lead, iron, magnesium, aluminium, manganese.

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.   

The answer is d for this question