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Answers:Most active metal is Francium, bottom f column 1 Most active nonmetal is Fluorine, top of column 17
Answers:Just use common sense. With problem 1 if MgSO4 is the most reactive metal then of course it's not going to be replaced by anything. With problem 2, the Cu can obviously only be replaced by hydrogen.
Answers:Your question relates to simple properties how does the reactivity of alloys relate to the activity series of metals? well it depends whether it is coated or mixed [alloyed] and the reactivity of the metal. This should help: Galvanised steel... coating of zinc corrodes in preference to the iron, so zinc protects it until it is corroded away Stell .. corrodes rapidly in presence of water + air to rust Stainless steel is an alloy containing nickel and chromium as well as iron and this is virtually corrosion proof. For the straight metals, have a look at the reactivity series [or electrochemical series]. This is simply and clearly shown at http://www.gcsescience.com/r1-reactivity-series-metals.htm my chemistry teacher is of no help :( SHAME he is actually being paid to help you .. that is his job!
Answers:I use steel everyday but couldn't tell you the answers to some of these questions (I'm a draughtsman, not a welder, nevermind a chemist XD)...though I can tell you that iron isn't used in places where you would use SS or galvanized carbon steel, due to the fact that Iron is probably one of the worlds most corrosive metals. It rusts up big time, SS and Gal. Steel are both non-corrosive for the most part (certain grades of SS can slightly oxidise such as 304L)...Galvanised steel is a chemical process for Carbon steel (maybe more not sure) to make it rustproof also...all I really know on your questions sorry..hope I helped, I'm no expert :)