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How does acidified potassium permanganat...

How does acidified potassium permanganate solution react with
(i) KI
(ii) `H_(2)S`

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Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron (II) ions (ii) SO_(2) and (iii) oxalic acid? Write the ionic equations for the reactions.

Acidified potassium permanganate solution is decolourised by

(i) Write the balanced equations to represent what happens when (a) acidified potassium permanganates reacts with hydrogen sulphide ? (b) acidified potassium dichromate solution reacts with iron (II) solution (ionic equation) ? (ii) The figure given below illustrates the first ionisation enthalpies of first, second and third series of transition elements. (a) Which series amongst the first, second and third series of transition elements have the highest first ionisation enthalpy and Why ? (b) Why there is a fall in IE_(2) from Cr to Mn and from Cu to Zn ? Explain.

Decolourisation of acidified potassium permanganate occurs when H_2O_2 is added to it.This is due to: