JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ev160
Select the correct statements about thermal pollution of a river by a power plant.
AThe dissolved oxygen of the river rises because gases are more soluble in hot water
BWarm water dissolves less oxygen than cool water
CMicrobial decay of organic matter speeds up in warmer water
DThe metabolic rate of aquatic organisms rises, increasing their oxygen demand
Answer: B, C, D
Raising the temperature lowers gas solubility, raises metabolic rates and speeds bacterial decay, so the oxygen supply falls while demand rises. The statement that gases are more soluble in hot water is false.