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The pH of which salt is independent of i...

The pH of which salt is independent of its concentration :
(P)`(CH_3COO)C_5H_5NH` , (Q)`NaH_2PO_4` , (R)`Na_2HPO_4`, (S)`NH_4CN`

A

1,2,3,4

B

1,4

C

2,3

D

1,2,3

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The correct Answer is:
A
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