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40 ml of 0.1 M ammonia is mixed with 20 ...

40 ml of `0.1` M ammonia is mixed with 20 ml of `0.1 M HCI`. What is the pH of the mixture ? (`pK_(b)` of ammonia solution is `4.74.`)

A

`4.74`

B

`2.26`

C

`9.26`

D

5

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