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What are some examples of Oxidation numbers ?

Answer
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Hint:To solve the given question, we should have knowledge about oxidation numbers and how to calculate it. Oxidation Number, is the number of electrons gained or lost or shared to form a compound from an element.
Some general rules that follow oxidation number are that the oxidation number of a free element is always 0, the oxidation number of a Group 1 element in a compound is +1 , a Group 2 element in a compound is +2 and the sum of oxidation numbers of all of the atoms in a compound is of total charge of the molecule.

Complete answer:
The first example we could look forward to was the oxidation number of Cr in CrCl3 . Let the oxidation number of Chromium be x . We can say that the total charge or molecule is zero.
x3=0
x=+3
Therefore, the oxidation number of Cr in CrCl3 is +3 .
Next one can be KCl , so, oxidation number of Cl is 1 . While in the case of Cl2 , it is 0 . In KClO2 , the oxidation number of Cl is +3.
In case of KMnO4 , the oxidation number of Mn is ;
Let the oxidation number of Mn be x . The oxidation number of the molecule as a whole is 0 .
So, it can be calculated as :
+1+x8=0
x=+7
So, the oxidation number of Mn in KMnO4 is +7 .

Note:
While calculating the oxidation number the charge on the whole molecule should be duly noted and identified. This is a crucial step which should not be messed up to find the correct oxidation state.
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