A) Acidic buffer will be effective within the \[pH\]range \[(p{{K}_{a}}\pm 1)\]
B) Basic buffer will be effective within the pH range \[(p{{K}_{w}}-p{{K}_{b}}\pm 1)\]
C) \[{{H}_{3}}P{{O}_{4}}+Na{{H}_{2}}P{{O}_{4}}\] is not a buffer solution.
D) Buffer behave most effectively when the [Salt] / [Acid] ratio equal to 1.
Correct Answer: C
Solution :
[c] For acidic buffer, buffer capacity is maximum at \[pH=p{{K}_{a}}\]and for basic buffer-it is maximum at \[pH=p{{K}_{w}}-p{{K}_{b}}\] Buffer is always effective within a \[pH\]range of 1 with respect to the pH at maximum buffer capacity. \[{{H}_{3}}P{{O}_{4}}+{{H}_{2}}P{{O}_{4}}^{\Theta }\]is a buffer solution.
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