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In which of the following cases will nei...

In which of the following cases will neither pH nor pOH be less than 5 at 298 K ?

A

An aqueous solution of NaOH molarity `10^(-4) M`.

B

An aqueous solution of ammonium acetate.

C

An aqueous solution of `NH_(3)` having concentration 0.1M and `K_(b) =1.8xx10^(-5)` for `NH_(3)`.

D

An aqueous solution of `CH_(3)COOH` having concentration 0.1 M and `K_(b) =(10^(-9))/(1.8)` for `CH_(3)COO^(-)` ion.

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The correct Answer is:
b
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