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Consider the following statements about different impurities in drinking water.
(I) Lead can damage kidney, liver, reproductive system.
(II) Sulphide content above 500 ppm causes laxative effect.
(III) Nitrate content above 50 ppm causes diseases such as methaemoglobinemia (blue baby syndrome)
Out of the above

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Only III is correct

All but I are correct

All but II are correct

I, II and III are correct

answer is D.

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Detailed Solution

All of the given statements regarding presence of lead, nitrate and sulphate in drinking water are correct.

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