Which of the following involves gain of five electrons ?

1.	Which of the following involves gain of five electrons ?
Answer» `MnO_(4)^(-) RARR Mn^(2+)` `CrO_(4)^(2-) rarr Cr^(3+)` `MnO_(4)^(2-) rarr MnO_(2)` `Cr_(2)O_(7)^(2-) rarr 2Cr^(3+)` Answer :A

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