Which are correct statements about KMnO_4?

JEE Advanced Chemistry question

Which are correct statements about ?

(A)Its solution is unstable in acidic mediumCorrect
(B)Its small quantity added to conc. , a green coloured solution containing ions is formedCorrect
(C) changes to in basic solution
(D)It is self-indicator in or titrationCorrect

Answer: (A),(B),(D)

Solution

solutions slowly decompose (releasing ), and this instability is more pronounced in acidic medium, so (a) is correct. A trace of dissolved in cold concentrated forms the permanganyl cation (b). Permanganate reduces to

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Question ID VK-159894