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Select incorrect statement(s).

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Phenolphthalein is SUITABLE indicator for the titraction of HCl(aq) with `NH_4OH (aq). `
An acid-base indicator in a buffer solution of `pH= pK_(LN)+ 1` is ionized to the extent of 90%
In the titration of a monoacidic WEAK base with a strong acid, the pH at equivalent point is always calculated by `pH= 1/2 [pK_w - pK_b - logC] `
When `Na_3PO_4(aq)` is titrated with HCl (aq.), the pH of solution at second equivalent point is calculated by `1/2 [pK_(a_(1)) + pK_(a_(2))]`

Answer :A::B::C


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