D-And F-Block Elements Ques 442

Question: $ KMnO_4 $ acts as an oxidizing agent in acidic medium. The number of moles of $ KMnO_4 $ needed to react with one mole of sulphide ions in acidic solution is

Options:

A) 2/5

B) 3/5

C) 1/5

D) 4/5

Show Answer

Answer:

Correct Answer: A

Solution:

$ 5{{S}^{2-}}+2MnO_4^{-}+16{{H}^{+}}\to 2M{{n}^{2+}}5S+8H_2O$

5 moles of sulphide ion require 2 moles of $ KMnO_4. $

Thus, 1 mole of sulphide ion requires $ \frac{2}{5} $ moles of $ KMnO_4 $ .



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