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The alkalinity due to carbonate ion is 2P when?

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The alkalinity due to carbonate ion is 2P when?

(a) P = M

(b) P > M/2

(c) P = M/2

(d) P < M/2

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Asked question is from Alkalinity of Water and its Estimation in chapter Water and its Treatment of Engineering Chemistry II

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Correct choice is (c) P = M/2

Best explanation: The alkalinity due to carbonate ion is 2P when P = M/2.

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