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As per IS 10500:2012, for drinking water in the absence of alternate source of water, the permissible limits for chloride and sulphate, in mg/L, respectively are

1. 250 and 200
2. 1000 and 400
3. 200 and 250
4. 500 and 1000

Correct answer: 500 and 1000

Solution

The correct option is right because IS 10500:2012 specifies that the permissible limits for chloride and sulphate in drinking water are set at 500 mg/L and 1000 mg/L, respectively, to ensure safety and health standards for consumption.

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