Write the balanced equation for the following chemical reaction:

Phosphorus burns in chlorine gas to form phosphorus pentachloride.

Write a brief note on corrosion.

What is an oxidation reaction? Give an example of an oxidation reaction. Is oxidation an exothermic or an endothermic reaction?

Define a combination reaction. Give one example of a combination reaction which is also exothermic.

When water is added to a white powder 'A', vigorous reaction takes place and a large amount of heat is released. 'A' is also used for white washing. Identify 'A', write a chemical equation for its reaction with water and name the product.

What is meant by redox reaction? Identify the substance oxidised and reduced in the following reaction:

${\mathrm{Fe}}_2{\mathrm{O}}_3+2\mathrm{Al}\to {\mathrm{Al}}_2{\mathrm{O}}_3+2\mathrm{Fe}$