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Please find below the solution to the asked query.

16. The correct answer is 4. Minamata disease .

Minamata disease is a neurological disorder caused by eating large quantities of fish and shellfish polluted by methyl mercury, which results into methyl mercury poisoning.

18. The correct answer is 4. Sulphur dioxide.

The gaseous oxides (CO2, NO2 and SO2) present in the air as chemical pollutants mix with water in air to form acids such as carbonic acid, nitric acid and sulphuric acid.This acid comes down as acid rain and causes corrosion of marble statues.

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