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One mole of ammonia was completely absor...

One mole of ammonia was completely absorbed in one litre solution each of (a) 1 M HCI, (b) 1 M `CH_3COOH` and (c) 1 M `H_2SO_4` at 298 K.
The decreasing order for the pH of the resulting solution is (Given `K_(b) (NH_3) = 4.74`)

A

`b gt c gt a `

B

`a gt b gt c `

C

`b gt a gt c `

D

`c gt b gt a `

Text Solution

Verified by Experts

The correct Answer is:
C
a) `NH_3 + HCl to NH_4Cl`
1M of `NH_3` completely reacts with 1M HCl. The salt formed is acidic
b) `CH_3COOH + NH_3 to CH_3COO NH_4`. The salt formed is neutral
c) `2NH_3 + H_2SO_4 to (NH_4)_2 SO_4 `. 1 M of `NH_3` need 0.5 M of `H_2SO_4 `, 0.5 M still remain in solution.
The salt is acidic.
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