JEE Main202125 Feb 2021Evening ShiftChemistryEnvironmental ChemistryActual
Given below are two statements: Statement I: The pH of rain water is normally ~ 5 . 6 . Statement II : If the 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:
Options
- ABoth Statement I and Statement II are true.
- BStatement I is false but Statement II is true.
- CStatement I is true but Statement II is false.
- DBoth Statement I and Statement II are false.
Correct answer
A. Both Statement I and Statement II are true.
Step-by-step solution
Both statements are correct. Normally rain water has pH of 5 . 6 due to the presence of H + ions formed by the reaction of rain water with carbon dioxide present in the atmosphere. Normal rain has a pH of about 5.6. This is because it reacts with carbon dioxide in the atmosphere and forms mildly acidic carbonic acid before it becomes rain.