Potassium Permanganate Is NOT a Primary Standard.Why

question 18

Multiple Choice

Potassium permanganate is NOT a primary standard.Why?
I Solid KMnO₄ contains traces of MnO₂.
[ _actual] < [ _calculated]
II Permanganate reacts with organic material in distilled water.
[ _actual] > [ _calculated]
III Permanganate is unstable in aqueous solution,producing MnO₂,O₂,and OH⁻.
[ _actual] < [ _calculated]
IV The presence of MnO₂,Mn²⁺,heat,light,acids,and bases increase the rate of reaction between permanganate and water.
[ _actual] < [ _calculated]

• A)I and II
• B)I,II,and IV
• C)II,III,and IV
• D)I,III,and IV
• E)I,II,and III

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