Zinc will react with dilute Sulphuric Acid to form salt and hydrogen gas

Write a chemical equation for the reaction taking place in the test tube. How does the colour of the solution change? What is the change in colour of iron nails? 

What is your observation in the following case:

Burning of magnesium in air.

Complete the following reaction:

$\mathrm{C}\mathrm{o}\mathrm{p}\mathrm{p}\mathrm{e}\mathrm{r}\mathrm{ }\mathrm{s}\mathrm{u}\mathrm{l}\mathrm{p}\mathrm{h}\mathrm{a}\mathrm{t}\mathrm{e}+\mathrm{Z}\mathrm{i}\mathrm{n}\mathrm{c}\mathrm{ }\to$