Acidified potassium permanganate acts as a strong oxidising agent and in doing so the purple manganate seven ion is reduced to
Correct answer: A. the almost colourless manganese two ion
- A. the almost colourless manganese two ion
- B. manganese metal
- C. the green manganate six ion
- D. brown manganese dioxide
Explanation
In acidic solution permanganate is reduced from plus 7 to plus 2, and the sharp change from deep purple to almost colourless is what makes it self indicating in titrations. In neutral or alkaline conditions the reduction stops at manganese dioxide, giving a brown precipitate instead. The acid used must be dilute sulphuric acid, since hydrochloric acid would itself be oxidised to chlorine.
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About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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