In a water body, too much sewage leads to
a decrease in the temperature of the water which cause in death of aquatic animals
an increase in the number of aquatic animals in the water
an increase in the bacterial population which reduces the level of oxygen in the water
a decrease in the bacterial population which increases the level of oxygen in the water
Correct answer is C
No explanation has been provided for this answer.
The solvent used for removing grease stain is
turpentine
ammonia solution
ethanol
solution of borax in water
Correct answer is B
No explanation has been provided for this answer.
An example of a hygroscopic substance is
CuO (S).
MgCL2(S).
CaCL2(S).
NaOH(S).
Correct answer is A
No explanation has been provided for this answer.
Steam changes the colour of anhydrous cobalt (ll) chloride from
white to red
blue to white
blue to pink
white to blue
Correct answer is C
No explanation has been provided for this answer.
The constituent of air that acts as a diluent is
nitrogen
carbon (IV) oxide
noble gases
oxygen
Correct answer is A
No explanation has been provided for this answer.