A) 2/5
B) 3/5
C) 1/5
D) 4/5
Correct Answer: A
Solution :
[a] \[5{{S}^{2-}}+2MnO_{4}^{-}+16{{H}^{+}}\to 2M{{n}^{2+}}5S+8{{H}_{2}}O\] 5 moles of sulphide ion require 2 moles of \[KMn{{O}_{4}}.\] Thus, 1 mole of sulphide ion requires \[\frac{2}{5}\]moles of\[KMn{{O}_{4}}\].
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