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Question

Which pollutant from the following is mainly responsible for the formation of acid rain?

This question was previously asked in
RRB NTPC 2025 Graduate CBT 2 Question Paper PDF (10-Jul-2026) (Shift 1)
The correct answer is

Sulphur dioxide

Acid rain forms when acidic gases released into the atmosphere dissolve in rainwater to produce dilute acids.

Sulphur dioxide (SO2), emitted mainly from burning fossil fuels, reacts with water and oxygen to form sulphuric acid, which is the chief cause of acid rain, along with oxides of nitrogen.

Carbon monoxide is a toxic gas but does not form a strong acid, ozone is an oxidising pollutant, and ammonia is basic in nature, so none of these is the main cause.

Hence, the pollutant mainly responsible for acid rain is Sulphur dioxide.

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