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In lime soda process, the change in the hardness of the water needs ________

(a) Change in dose of lime

(b) Change in dose of soda

(c) Change in dose of lime and soda

(d) Change in dose either lime or soda

I got this question in an online interview.

I would like to ask this question from Lime Washing Soda Method topic in section Water of Applied Chemistry

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Correct choice is (c) Change in dose of lime and soda

Easy explanation: In lime soda process, the change in the hardness of the water needs the change in the dose of the lime and soda.

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