Which of the following sulphides is insoluble in dilute HCl?
Na2S
ZnS
CuS
FeS
Correct answer is C
No explanation has been provided for this answer.
Which of the following metals does NOT form a stable trioxocarbonate (IV)?
Fe
Al
Zn
Pb
none of the options is correct
Correct answer is E
Fe, Al, Pb, and Al trioxocarbonate(IV) compounds are decomposed by heat to their oxide and carbon(IV) Oxide
H and S;Cl
H and O;Cl
H and S;C and O
H and Cl;S and O
Correct answer is A
No explanation has been provided for this answer.
Which of the following will react further with oxygen to form higher oxide?
NO and H2O
CO and CO2
SO2 and NO
CO2 and H2O
Correct answer is C
No explanation has been provided for this answer.
Oxygen-demanding waste are considered to be a water pollutant because they?
deplete oxygen which is necessary for the survival of aquatic organism
increase oxygen which is necessary for survival of aquatic organism
increase other gaseous substances which are necessary for the survival of aquatic organisms
deplete other gaseous species which is necessary for the survival of aquatic organisms
Correct answer is A
No explanation has been provided for this answer.