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Q.

Which of the following combinations regarding True ('f) and False (F) nature of following statement is correct?
Statement-I: pH of water at any temperature will be 7.
Statement-2: Acid dissociation constant of water at 298 K is equal to $10^{- 14}$ .
Statement-3: For any aqueous acid solution $(pH + pOH)$ will be equal to 14 at 298 K.
Statement-4: Degree of dissociation of water at 308 K will be greater than $1.6 \times 10^{- 7} %$ .
Statement-5: On increasing' dilution extent of dissociation of MCI will increase.

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a

TFT'l"I'

b

FT'TFF

c

TTFFT

d

FFTTF

answer is D.

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Detailed Solution

3)For any aqueous acid solution $(pH + pOH)$ will be equal to 14 at 298 K. Here, the solution is highly acidic.

4) pH of water changes with temperature because degree of dissociation and hence, $k_{w}$ also changes.

$k_{a} {(H_{2} O)}_{298 K} = \frac{10^{- 14}}{\frac{1000}{18}} = 1.8 \times 10^{- 16}$

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Which of the following combinations regarding True ('f) and False (F) nature of following statement is correct? Statement-I: pH of water at any temperature will be 7. Statement-2: Acid dissociation constant of water at 298 K is equal to 10−14. Statement-3: For any aqueous acid solution (pH+ pOH) will be equal to 14 at 298 K. Statement-4: Degree of dissociation of water at 308 K will be greater than 1.6×10−7%.Statement-5: On increasing' dilution extent of dissociation of MCI will increase.