MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryd and f Block elementsOther Compounds of d-block Elements
Which of the following oxides of manganese is amphoteric ?
A.MnO (b) Mn2O3
C.Mn2O7
D.MnO2✓ Correct
Explanation
MnO2 has an oxidation state of +4 and it can react with both acids and bases. That is the reason it is amphoteric in nature. The reaction of MnO2with a base: 2 2 2 4 2 2MnO + 4KOH + O 2K MnO 2H O -> The reaction of MnO2 with an acid: 2 2 2 2 MnO + 4HCl MnCl + Cl 2H O -> Hence, option (d) is the correct one.
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