Giving appropriate examples (at least three), explain how the reactivity of a metal is related to its mode of occurrence in nature.

Give two examples of less reactive metals

Taking the example of sodium chloride , explain how do metals combine with nonmetals.

Giving appropriate examples, explain how the types of processes of adsorption (physisorption and chemisorption) are influenced by the prevailing temperature , the surface area of adsorbent and the activation energy of the process?

Give four examples of highly reactive metals.

(a) What is reactivity series of metals ? What can you say about the reactivity of metals which are placed: (i) in the middle of reactivity series? (ii) towards the bottom of reactivity series? (iii) towards the top of reactivity series? (b) A metal is placed in the middle of reactivity series. Suggest a chemical process to obtain this metal from its oxide. Support you answer with one example. (c) A metal is placed towards the top of the reactivity series. Suggest a chemical process to obtain this metal from oxide. Support your answer with one example.

Give examples of three food chains operating in nature.

Explain how a vector can be resolved into its rectangular components in three dimensions.

Give any four examples of moderately reactive metals.