00:01
Hello everyone let's solve this question in this question we have to find out that which one is the redux reaction out of the given five reactions so let's understand what is a redrox reaction first so redox reaction is a reaction in which both oxidation and reduction reactions are going on simultaneously so oxidation is a reaction in which there is increase in oxidation number oxidation number of any element and reduction is when there is decrease in oxidation number oxidation number of any element so let's check whether the which of the reaction shows these properties so, if we check the reaction number 5, that is al2 so4, ultrase, that is aluminum sulphate plus 6 potassium gives 3 more so k2 so4 plus 2 al.
01:23
So this is a balanced reaction and we have to check it whether it is a redox or not.
01:28
So let us write the oxidation number of all the elements here.
01:32
So, for aluminum it is plus 3.
01:35
For potassium, it is in its elemental state.
01:39
So, zero.
01:40
Here, the potassium is having oxidation state plus 1 and aluminum is having oxidation state zero.
01:48
So we can see here that aluminum has shown oxidation state change from 3 to 0.
01:55
That is, there is, decrease in oxidation oxidation number...