General science UPPSC 2004 GS-I
Question

Assertion (A): Coal based thermal power stations contribute to acid rains.
Reason (R): Oxides of carbon are emitted when coal burns.

Select the correct answer using the code given below:
Code:

Answer & Solution

Answer: (Detailed Solution Below)

Option B: Both A and R are true but R is not the correct explanation of A

Detailed Solution:

The correct answer is “Both A and R are true but R is not the correct explanation of A”.

Coal-based thermal power stations do contribute to acid rains. This is because burning coal releases sulfur dioxide (SO2) and nitrogen oxides (NOx), which react with water in the atmosphere to form sulfuric acid (H2SO4) and nitric acid (HNO3), respectively. These acids then fall to the ground as acid rain.

Oxides of carbon (specifically carbon monoxide, CO, and carbon dioxide, CO2) are indeed emitted when coal burns. However, these carbon oxides do not directly contribute to acid rain formation.

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