Which of the following are anions of class \( \mathrm{A} \) \( \mat...

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Which of the following are anions of class \( \mathrm{A} \)
\( \mathrm{P} \)
(1) \( \mathrm{CH}_{3} \mathrm{COO}^{-} \)
(2) \( \mathrm{SO}_{4}{ }^{2-} \)
W
(3) \( \mathrm{C}_{2} \mathrm{O}_{4}{ }^{2-} \)
(4) \( \mathrm{CrO}_{4}{ }^{2-} \)
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