Question

The loss or reduction of chlorophyll in the leaves is due to:
A.Bleaching by chlorine
B.Reduction be chlorofluorocarbons
C.Bleaching by sulphur dioxide
D.Oxidation by $N{O_2}$

Answer 1

In the given question firstly we have to get the number of atoms that are in the formula for the chlorophyll so that we can get what will affect and what will not to the pigment. Therefore the formula obtained is the ${C_{55}}{H_{72}}{O_5}{N_4}Mg$ . Now we can get the reasons which result in the loss of the pigment which in this case is the exposure of the sulfur dioxide gas.

Complete answer:
Here according to the question statement we get that the complete chemical configuration of the chlorophyll is therefore:
i.Number of the Carbons : $55$
ii.Number of the hydrogens : $72$
iii.Number of the oxygen : $5$
iv.Number of nitrogen : $4$
v.Number of magnesium : $1$
Thus the chemical formula of the pigment should be ${C_{55}}{H_{72}}{O_5}{N_4}Mg$
Now regarding the process of the loss of the pigment from the core of the green leaves ( where it is mostly found for the sake of the photosynthesis ) is as follows:
The process of this loss is termed as Chlorosis. Chlorosis is generally and most commonly caused when the leaves don’t possess or are deprived of enough nutrients in order for the synthesis of all the chlorophyll they need.
This therefore can be a reason due to just one or either by a combination of factors that are:
-Specific type of mineral deficiency found in the soil. These minerals are the ones such as iron or magnesium.
-Deficiency of either of the nitrogen or protein or in some cases both combine.
-The cause due to the poor drainage or the waterlogging of the roots because of flooding.
-Or the severe exposure to the sulphur dioxide gas.
-By observing the reasons there is just one which supports the answer.
So the right answer would be option C, bleaching by sulphur dioxide.

Note:
Chlorophyll is a green photosynthetic pigment found in plants, algae, and cyanobacteria. Chlorophyll absorbs mostly in the blue and to a lesser extent red portions of the electromagnetic spectrum, hence its intense green color.