Question

how to find oxidation no of any compound and what we have to learn to find this no.
Explain ​

Answer 1

Oxidation-reduction reactions (redox reactions) are reactions in which electrons are lost by an atom or ion in one reactant and gained by an atom or ion in another reactant. To determine if a redox reaction has occurred and to identify the element oxidized and the element reduced.

Example: Determine if a redox reaction has occurred. If so, identify the element oxidized and the element reduced.

I2O5 (s) + 5 CO (g) --> I2 (s) + 5 CO2 (g)

Solution:

Assign oxidation numbers to each element:

I2O5 (s)

+

5 CO (g)

-->

I2 (s)

+

5 CO2 (g)

+5

-2

+2

-2

0

+4

-2

Compare oxidation numbers from side to side:

The oxidation number of I decreased from +5 in I2O5 to 0 in I2.

The oxidation number of C increased from +2 in CO to +4 in CO2.

Since the oxidation numbers of two elements changed from side to side, a redox reaction DID occur.

Since the oxidation number of I decreased from +5 to 0, I was reduced.

Since the oxidation number of C increased from +2 to +4, C was oxidized.

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