A compound that cannot decolourise \( \mathrm{KMnO}_{4} \) P soluti...

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A compound that cannot decolourise \( \mathrm{KMnO}_{4} \)
P solution is -

W
(1) \( \mathrm{CO}_{3}^{-2} \)
(2) \( \mathrm{NO}_{2}^{-} \)
(3) \( \mathrm{S}^{-2} \)
(4) \( \mathrm{Cl}^{-} \)
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