Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
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.
CO and SO3
CO and SO2
CO,SO2 and SO3
CO and H2S
Correct answer is B
When fuels containing sulphur are burned, sulphur compounds in the fuel are oxidised to sulphur dioxide while carbon compound are oxidized to carbon monoxide
When steam is passed through red hot carbon, which of the following are produced?
Hydrogen oxygen and carbon (IV) oxide
Hydrogen and carbon (IV) oxide
Hydrogen and carbon (II) oxide
Hydrogen and trioxocarbonate (IV) acid
Correct answer is C
No explanation has been provided for this answer.
The reaction Mg + H2O → MgO + H2 takes place only in the presence of?
excess Mg ribbon
excess cold water
very hot water
steam
Correct answer is D
No explanation has been provided for this answer.
The approximate volume of air containing 10cm3 of oxygen is?
20 cm3
25 cm3
50 cm3
100 cm3
Correct answer is C
Volume of air containing 10 cm O2 is
(100 x 10)/(20) = 50cm3