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Which of the following anions is the weakest base ?

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Which of the following anions is the weakest base ?
A. `C_(2)H_(5)O^(-)`
B. `CN^(-)`
C. `CH_(3)COO^(-)`
D. `NO_(3)^(-)`
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Correct Answer - D
The stronger the conjugate acid, the weaker the conjugate base. Since `HNO_(3)` is the strongest acid, its conjugate base `(NO_(3)^(-))` is the weakest base.
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