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NEET levelSingle correct optionDifficulty 1 of 3ie003

At 298 K, the pH of $0.001 M$ $HCl$ (completely ionised) is

A $11$
B $1$
C $3$
D $2$

Answer: C

HCl is a strong acid, so

[H X^{+}] = 1 \times 1 0^{- 3} M

and

pH = - lo g (1 0^{- 3}) = 3

.

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