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JEE · NEET Previous Year Question

$The pH of 10^{- 8} MHCl solution is$

Topic: JEE PYQ

Answer: C. Full step-by-step solution below.

A $8$
B $more than 8$
C $between 6 and 7$
D $slightly more than 7.$

Correct answer: C

Solution

(c) : From H_{2} O, (H^{+}) = 1 \times 10^{- 7} M From HCl, (H^{+]} = 1 \times 10^{- 8} M) ∴ Total (H^{+}) = (1 \times 10^{- 7} + 1 \times 10^{- 8}) M = (1 \times 10^{- 7} + 0.1 \times 10^{- 7}) M = 1.1 \times 10^{- 7} M ∴ pH = - log (1.1 \times 10^{- 7}) = 6.9586

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