The natural rain is specifically termed as an acid rain when its pH value is :
Show Hint
- 7
- 4
- 10
- 8
The Correct Option is B
Solution and Explanation
Step 1: Identify the pH of normal rain.
Natural, unpolluted rain typically has a pH between 5.0 and 5.6 because atmospheric carbon dioxide reacts with water to form weak carbonic acid ($H_2CO_3$).
Step 2: Define Acid Rain threshold.
Rain is termed "acid rain" when its pH falls below 5.6. This happens when sulfur dioxide ($SO_2$) and nitrogen oxides ($NO_x$) from industrial emissions react with water to form sulfuric and nitric acids. Among the choices provided, a pH of 4 (Option 2) clearly indicates an acidic condition far below the natural threshold.
Step 3: Evaluate other options.
• pH 7 is neutral (Pure water).
• pH 8 and 10 are alkaline (basic).
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