Differentiate between exothermic and endothermic reactions by giving one example of each. [3 marks]

Give two examples each of:

Redox reactions

Give two examples each of:

Combination reactions.

Give reason why:

Na acts as a reducing agent while chlorine acts as an oxidising agent in reaction:

2Na(s) + Cl₂(g) → 2NaCl(s)

Give reason why:

White coloured AgCl turns grey when kept in sunlight.