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Zinc Ion

Which of the ...

Question

Which of the following statements/relationships is not correct ?

Upon hydrolysis, salt of a strong acid and a weak base gives a solution of pH < 7

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p H = - l o g [H^{+}]

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Only at 25C, the pH of water is 7

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The value of

p K_{w}

at 25C is 7

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Solution

The correct option is D The value of $p K_{w}$ at 25C is 7
At $25^{o} C$ , ionic product of water $K_{W}$ is equal to $10^{- 14}$ , Hence, $p K_{W} = 14$

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Similar questions

p H

N H_{4} C l

7

C H_{3} C C O O N a

7

N H_{4} C l

N H_{4} O H

H C l

C H_{3} C O O N a

C H_{3} C O O H

N a O H

	Type of Acid	Type of Base	pH of aqueous solution of salt
$(1)$	Strong acid	Strong base	Neutral
$(2)$	Strong acid	Weak base	Acidic
$(3)$	Weak acid	Strong base	Basic

= 7

< 7

> 7

\begin{matrix} List - I (Salt solution) & List - II (pH) (I) 0.1 M K C N & (P) 7 (II) 0.1 M P h N H_{3} C l & (Q) 6.5+ \frac{1}{2} p K_{a} (III) 0.1 M K C l & (R) 7.5 - \frac{1}{2} p K_{b} (IV) 0.1 M C H_{3} C O O N H_{4} (K_{a} = K_{b}) & (S) 7.5 + \frac{1}{2} p K_{a} - \frac{1}{2} p K_{b} (T) 7.5 - \frac{1}{2} p K_{a} - \frac{1}{2} p K_{b} (U) 7.5 - \frac{1}{2} p K_{a} + \frac{1}{2} p K_{b} \end{matrix}

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