'Break point' in break point chlorination curve is a point for which the residual chlorine for an applied dose of chlorine is:

Zero

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Maximum

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In the stage when chlorination of water should be stopped

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Solution

The correct option is D In the stage when chlorination of water should be stopped

Break point is a point at which the chlorine demand has been totally satisfied. The chlorine has reacted with all reducing agents, organics, and ammonia in the water.

After this point, whatever chlorine is added breaks free from it and appears as a residual $C l_{2}$ and hence this point is referred as break point dose.

The amount of $C l_{2}$ required to reach upto this point is referred as break point dose.

Theoretically no chlorine is requied to be added beyond break point but practically it is added to ensure the residual chlorine of $0.2 m g / l$ at contact period of 10 min.

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