Q23 of 58 Page 32

Give reason why:
White coloured AgCl turns grey when kept in sunlight.

White silver chloride turns grey in sunlight due to the decomposition of silver chloride into silver and chlorine by light.

The reaction that takes place is:

2AgCl + sunlight → 2Ag + Cl₂

The above reaction is an endothermic reaction.

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

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:

Colour of the solution changes when iron nail is dipped in copper sulphate solution.

Give reason why:

Lime water turns milky when CO₃ is passed through it?

Questions · 58

1. Chemical Reactions and Equations

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 21 21 22 23 23 23 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10

Give reason why:White coloured AgCl turns grey when kept in sunlight.