The answer to each of the questions is a single -digit integer ranging from 0 to 9. the appropriate bubbles below the respective question numbers in the ORS have to be darkened. for example,lf the correct answer to question numbers X,Y, Z, and W (say) are 6, 0, 9 and 2, respectively, then the correct darkening of bubbles will look like the following.
The oxidation number of Mn in the product of alkaline oxidative fusion of MnO2 is
