pH value of water of acid-rain is ranging between

Question

Accepted Answer

The pH value of water of acid rain is ranging between 0 to 5.6 because:

*   **Option 3 is correct because:** Acid rain is defined as precipitation with a pH lower than that of normal rain. Normal rain is slightly acidic (around 5.6) due to the presence of dissolved carbon dioxide. Acid rain is significantly more acidic than this. Therefore, the pH of acid rain must be *below* 5.6. A range of 0 to 5.6 accurately reflects this acidity. The lower the pH, the stronger the acidity.

*   **Option 1 is incorrect because:** While the pH range of 0 to 7 represents acidic conditions, it's too broad. Acid rain is specifically defined by its pH being *below* the normal pH of rainwater (5.6). The range 0-7 includes values that are not considered acid rain.

*   **Option 2 is incorrect because:** The pH range of 7 to 14 represents alkaline or basic conditions, which is the opposite of acidic. Acid rain is, by definition, acidic, so its pH cannot fall within this range.

*   **Option 4 is incorrect because:** The pH range of 0 to 14 represents the entire pH scale, encompassing both acidic and alkaline conditions. While acid rain's pH *is* within this range, it's not a specific or accurate description. The range 0-5.6 is much more precise and relevant to the definition of acid rain.