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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ie108

At 373 K, take $K_{w} = 1.0 \times 1 0^{- 12}$ . Select the correct statement(s).

AA solution of pH 6.5 at this temperature is basic.
BPure water at this temperature has pH 6 and is neutral.
CThe pH of $0.01 M$ $NaOH$ at this temperature is 12.
DThe pH of $0.01 M$ $NaOH$ at this temperature is 10.

Answer: A, B, D

Neutral water has

[H X^{+}] = K_{w} = 1 0^{- 6}

, so pH 6 and

p K_{w} = 12

. For

0.01 M

NaOH

:

pOH = 2

and

pH = 12 - 2 = 10

. Since neutral pH is 6, pH 6.5 means

[H X^{+}] < [OH X^{-}]

, i.e. basic. pH 12 is the 298 K value.

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