Give examples of the least reactive metals.

Give an example for the class Hexactinellida ?

Aluminium and zinc do not corrode easily even though they are reactive metals. Give reasons for your answer.

Which method will you use to reduce the following ? (i) Oxides of less reactive metals (ii) Oxides of moderately reactive metals (iii) Oxides of highly reactive metals. explain by giving a suitable example.

Give the steps in the extraction of metals of low and medium reactivity from their respective sulphide ores.

Give an example for limbless reptile.

Give example of : Hypercalcemic hormone

Give one example of Chemotropism.

Among the alkali metals cesium is the most reactive because

Give reason : Nitrogen is less reactive at room temperature.