Out of the following transition elements, the maximum number of oxidation states are shown by:
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Mn (Z = 25)
Explanation:
The maximum oxidation state is the number of 4s electrons plus the number of unpaired 3d electrons.
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$\ce{KMnO_4}$ acts as an oxidising agent in acidic medium. The number of moles of $\ce{KMnO_4}$ that will be needed to react with one mole of sulphide ions in acidic solution is
When $\ce{KMnO_4}$ solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because