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$pH of 10^{- 6} M HCl is$

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Just less than 6

exactly equal to 6

just greater than 6

just less than 7

answer is B.

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Detailed Solution

pH is defined as the negative log of hydrogen ion concentration.

The dissociation coefficient of HCl can be considered to be unity for such low concentration and HCl being a strong electrolyte.

pH = -log(1 x 10^-6) = -(-6) = 6

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