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Which of the following solutions cannot act as a buffer?
(i) H₃PO₄ ,
(ii) NaH₂PO₄
(iii) NaHCO₃
(iv) H2CO₃
(v) NH₄Cl
(vi) HCl
(vii) CH₃COOH
(viii) CH₃COONa.

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