Which of the following is incorrect for KMnO4 to be used as an oxidising agent?
(a) HCl cannot be used because some KMnO4 is consumed in the reaction.
(b) Nitric acid is not used for the above purpose because it itself acts as a self oxidising agent and will react with the reducing agent.
(c) The equivalent weight of KMnO4 in basic medium is 158.
(d) The number of electrons involved in oxidation of KMnO4 in acidic medium is 3.
Answers
Option (d) is the incorrect option.
5 electrons are actually involved.
Answer:
The Incorrect options are (c) The equivalent weight of KMnO4 in the basic medium is 158. and (d) The number of electrons involved in the oxidation of KMnO4 in an acidic medium is 3.
Explanation:
Statement (a) HCl cannot be used because some KMnO4 is consumed in the reaction. Is Correct as it reacts with KMnO4 to get oxidized and follows up with the liberation of Cl2 gas.
Statement (b) Nitric acid is not used for the above purpose because it itself acts as a self oxidizing agent and will react with the reducing agent. Is Correct as it is a very strong oxidizing agent which reduces the KMnO4.
Statement (c) The equivalent weight of KMnO4 in the basic medium is 158. This is Incorrect as the equivalent weight of KMnO4 in the basic medium is 52.66gm/equivalent.
statement (d) The number of electrons involved in the oxidation of KMnO4 in an acidic medium is 3. This is Incorrect as the number of electrons involved in the oxidation of KMnO4 in an acidic medium is 5.