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JEE Main levelSingle correct optionDifficulty 2 of 3ie022

$1 L$ of $HCl$ of pH $2$ is mixed with $1 L$ of $HCl$ of pH $3$ . The pH of the mixture is (use $lo g 5.5 = 0.740$ )

A $2.50$
B $2.26$
C $2.00$
D $3.00$

Answer: B

[H X^{+}]_{mi x} = (1 0^{- 2} + 1 0^{- 3}) /2 = 5.5 \times 1 0^{- 3} M

, so

pH = 3 - 0.740 = 2.26

. Averaging the pH values (2.50) is wrong because pH is logarithmic.

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