What is meant by metal reactivity series? State its importance (any two points).

What are oxides? Give two examples of each of the following oxides.

(a) Basic oxide

(b) Acidic oxide

(c) Amphoteric oxide

(d) Neutral oxide

State the effect of the following on the surroundings:

(a) an endothermic reaction

(b) an exothermic reaction

What do you observe when:

(a) an acid is added to a basic solution?

(b) ammonium chloride is dissolved in water?