Chlorine is passed through water for its purification .Its pH value will be
a) less than 7 b) more than 7 c) equal to 7 d) none of these

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Solution

a) less than 7
This is because, chlorine dissolve in water to produce a minute amount of HCl which makes the water slightly acidic.
Cl₂ + H₂O â†’ HOCl + HCl

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