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Which component is responsible for killing bacteria in water?

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Which component is responsible for killing bacteria in water?

(a) Low concentration of OH-

(b) High concentration of OH-

(c) High concentration of acid

(d) Low concentration of acid

The question was asked in exam.

I need to ask this question from Inorganic Chemical topic in division Inorganic Chemical Industries of Chemical Technology

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The correct choice is (b) High concentration of OH-

Explanation: Because of the higher concentration of hydroxide ion maintained to kill bacteria and insure a reasonable removal of Mg as Mg(OH)2, this effluent water must be re-carbonated to neutralize the excess alkalinity.

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