the oxidation number of Mn in MnO4- is +4 (true or false)
true
No, the oxidation number for Mn in MnO4^- is +7. It is +4 in MnO2.
True.
To determine the oxidation number of Mn in MnO4-, we can follow the following steps:
1. Identify the oxidation number of oxygen. In most compounds, oxygen has an oxidation number of -2.
2. Since there are four oxygen atoms in MnO4-, their total oxidation number is -8 (4 x -2 = -8).
3. The overall charge of the MnO4- ion is -1. This means the total oxidation number of all the atoms in the ion must add up to -1.
4. To find the oxidation number of Mn, we need to calculate the difference between the total oxidation number of all the atoms and the overall charge of the ion. In this case, (-8) - (-1) = -7.
5. The oxidation number of Mn in MnO4- is therefore +7, as the negative charge from oxygen atoms balances out the overall charge of the ion.
So, the statement that the oxidation number of Mn in MnO4- is +4 is false. The correct oxidation number is +7.