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The external treatment of water does not include __________

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The external treatment of water does not include __________

(a) Lime-soda process

(b) Sequestration

(c) Zeolites

(d) Ion-exchange process

I had been asked this question in class test.

This interesting question is from R, S- Configuration and Water Softening in portion Structure and Stereostructure of Molecules of Engineering Chemistry I

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Right choice is (b) Sequestration

Best explanation: The external treatments of water include lime-soda, zeolites and ion-exchange processes. It does not include sequestration.

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