Oxidation number,Types of Oxidation-Reduction Reactions
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March 04, 2016 |
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Oxidation number
The charge the atom
would have in a molecule (or an ionic compound) if
electrons were completely transferred.
1.Free elements
(un-combined state) have an oxidation number of zero.
Na, Be, K, Pb, H2,
O2,
P4 = 0
2.In mono atomic ions,
the oxidation number is equal to the charge on the ion.
Li+,
Li = +1; Fe3+, Fe = +3; O2-, O = -2
3.The oxidation number
of oxygen is usually –2. In H2O2 and
O22- it is –1.
4.The oxidation number
of hydrogen is +1 except when it
is bonded to
metals in binary compounds. In these
cases, its oxidation number is –1.
5.Group IA metals are +1, IIA metals are +2 and fluorine
is
always –1.
6. The sum of the oxidation numbers of all the
atoms in a molecule or ion is equal to the charge on the molecule or ion.
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Chemistry for class 12 ...........
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