Industrial effluent was acidified and treated with $H X_{2} S$ to give a yellow precipitate. The precipitate was insoluble in yellow ammonium sulfide, but dissolved in hot dilute nitric acid. If this metal is the pollutant, the disease it is associated with in the environment is:

Aitai-itai disease
BMinamata disease
Cblue baby syndrome
Dblackfoot disease

Answer: A

A yellow sulfide insoluble in ammonium sulfide, but soluble in hot dilute

HNO X_{3}

, is

CdS

, so the metal is cadmium (arsenic and tin sulfides would dissolve in ammonium sulfide). Cadmium contamination causes itai-itai disease. Mercury(II) sulfide is black and causes Minamata disease.

Practice Environmental Chemistry More on Water pollution, BOD and COD

Previous questionNext question

More questions on Water pollution, BOD and COD

A waste stream contains 45 mg L^-1 of glucose as its only organic matter. Take C = 12, H = 1, O = 16 and complete oxidation C6H12O6 + 6O2 ->... JEE Advanced level
Arrange the events of the eutrophication of a lake in the correct order: (i) fish die, (ii) fertiliser and detergent run-off adds nitrate an... JEE Advanced level
Groundwater of a village is analysed: pH 7.4, fluoride 4.2 ppm, nitrate 30 ppm, lead 20 ppb. Use these standard limits: pH 5.5 to 9.5, fluor... JEE Advanced level
A pollutant in drinking water from old pipes gives a yellow precipitate with potassium iodide, Pb^2+ + 2I^- -> PbI2, which dissolves in hot ... JEE Advanced level
In a COD test, a sample consumes 1.20 mmol of K2Cr2O7 per litre. Take 1 mol of K2Cr2O7 as equivalent to 1.5 mol of O2 (O = 16). The COD of t... JEE Advanced level
In a food chain the DDT concentrations (in ppm) are: water 0.00005, plankton 0.04, small fish 0.5, large fish 2.0, fish-eating bird 25. Whic... JEE Advanced level

Industrial effluent was acidified and treated with HX2​S to give a yellow precipitate. The precipitate was insoluble in yellow ammonium sulfide, but dissolved in hot dilute nitric acid. If this metal is the pollutant, the disease it is associated with in the environment is:

Answer: A

More questions on Water pollution, BOD and COD

Industrial effluent was acidified and treated with $H X_{2} S$ to give a yellow precipitate. The precipitate was insoluble in yellow ammonium sulfide, but dissolved in hot dilute nitric acid. If this metal is the pollutant, the disease it is associated with in the environment is: