Explain in term of gain or loss of oxygen with 2 example of each :
a. oxidation
b. reduction
Answers
Explanation:
oxidation : in this reaction hydrogen is lost and oxygen is gained
2mg + O2 = 2mgo
reduction : in this reaction hydrogen is gained and oxygen is lost
mgo+c=mg +co
Answer: Oxidation refers to the loss of electrons from a substance, while reduction refers to the gain of electrons by a substance. These two processes cannot occur without the other. That being said, if there's a reduction reaction, there must be an oxidation reaction. Or, if there's an oxidation reaction, there must be a reduction reaction. Don't be confused by reduction being a gain, though. Adding electrons is called reduction because the overall charge is reduced - more electrons means the substance becomes more negative.
->H2S + Cl2 → 2HCl + S
The O.N. of S increases from -2 to 0. So it is undergoing oxidation and O.N. of Cl2 decreases from 0 to -1. So it is undergoing reduction. Therefore it is a redox reaction.
->CuO + H2 → Cu +H2O
In this redox reaction, CuO is getting reduced to Cu since Oxygen is getting removed. So, the conversion of CuO to Cu is reduction reaction. H2 is getting oxidised to H2O. So, it is oxidation reaction.
-> Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
Oxidation state of Fe changes from 0 to +2 and oxidation state of Cu changes from +2 to 0.
-> MnO4-+ I- → MnO2 + I2
Here I- is oxidised to I2 and MnO4 - is reduced to MnO2.
-> Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O
In this reaction, Pb is getting oxidised to PbSO4 and PbO2 ias reduced to PbSO4.