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Question
Assign oxidation numbers to the underlined elements in the following species:
K2MnO4
Numerical
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Solution
K2MnO4
| +1 | x | -2 |
| K2 | Mn | O4 |
Then, we have
2(+1) +x + 4(-2) = 0
⇒ 2 + x - 8 = 0
⇒ x = + 6
Hence, the oxidation number of Mn is + 6.
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Chapter 7: Redox Reactions - EXERCISES [Page 280]
