D-And F-Block Elements Ques 490
Question: Number of electrons transfered in each case when $ KMnO_4 $ acts as an oxidising agent to give $ MnO_2,M{{n}^{2+}},Mn{{(OH)}_3} $ and $ MnO_4^{2-} $ are respectively
Options:
A) 3, 5, 4 and 1
B) 4, 3, 1 and 5
C) 1, 3, 4 and 5
D) 5, 4, 3 and 1
Show Answer
Answer:
Correct Answer: A
Solution:
When $ KMnO_4 $ acts as an oxidising agent and ultimately forms $MnO_4^{2-},MnO_2,Mn_2O_3 and Mn^{2+}$, then the number of electrons transferred in each case are 1,3,4,5 respectively.
The oxidation number of Mn in $ KMnO_4 $, $MnO_4^{2-},MnO_2,Mn_2O_3 and Mn^{2+}$ is 7, 6, 4, 3 and 2 respectively.
The number of electrons transferred corresponds to the change in the oxidation number.
