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Electrochemistry

Question

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With the halp of ionic equations describe what happen: When
(i) pH of a solution of dichromate ions is raised.
(ii) Potassium manganate is electro-chemically oxidised.

Solution

Answer:.

when pH is increased, i.e., solution is more basic, orange coloured dichromate ion change to yellow coloured chromate ion.

When potassium manganate is electro-chemically oxidised i.e., undergoes, electrolytic oxidation, it forms purple colour KMnO₄.

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