Question:
Given below are two statements:
Statement I :
The $\mathrm{pH}$ of rain water is normally $\sim 5.6$.
Statement II :
If the $\mathrm{pH}$ of rain water drops below $5.6$, it is called acid rain.
In the light of the above statements, choose the correct answer from the options given below:
Correct Option: , 4
Solution:
Both statements are correct.
Normally rain water has $\mathrm{pH}$ of $5.6$ due to the presence of $\mathrm{H}^{+}$ions formed by the reaction of rain water with carbon dioxide present in the atmosphere.