As per I.S. 456 - 1978, the pH value of water shall be

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Question:As per I.S. 456 - 1978, the pH value of water shall be

1. less than 6

2.equal to 6

3.not less than 6

4.equal to 7

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  1. As per I.S. 456 - 1978, the pH value of water shall be
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