(a) What happens when dilute hydrochloric acid is added to lead nitrate solution.
(b) Describe the two colour changes which take place when moist blue litmus is placed in a gas jar of chlorine.
(c) What is the colour change that takes place when chlorine water is exposed to sunlight? [5 MARKS]

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Solution

a) 2 Marks
b) 2 Marks
c) 1 Mark

(a) A white precipitate of lead chloride is obtained.
$P b (N O_{3})_{2} + 2 H C I (D i l .) \to P b C l_{2} L e a d c h l o r i d e (W h i t e p p t .) + 2 N N O_{3}$
(b) The moist blue litmus first becomes red and then it becomes colourless.
(c) Its colour changes from greenish yellow to colourless.

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