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.
Kerosine is commonly used to remove the red colour stain of palm oil from cloths because it
helps to spread the oil over a larger surface area
react with the oil to form an odourless compound
makes the oil evaporate easily by dissolving it
helps to dilute the oil and reduce its colour
Correct answer is C
No explanation has been provided for this answer.
The air around smelting industries is likely to contain
H2S, CO and N2
CO2, SO3 and H2
H2, SO2 and CO2
SO2, N2 and CO2
Correct answer is C
No explanation has been provided for this answer.
The solubility curve shows the variation of solute concentration with
volume
temperature
vapour density
pressure
Correct answer is B
No explanation has been provided for this answer.
2,500 cm3
1250 cm3
125 cm3
80 cm3
Correct answer is A
Percentage of noble gases in air is 1%
25 = (1/100) * T
∴ T = 25 * 100 = 2500 cm3
When water boilers are used for long period of time, the solid substances left behind as scale are
magnesium trioxosilicate (IV) and rust
magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI)
clay and magnesium troxosulphate (IV)
clay and rust
Correct answer is A
No explanation has been provided for this answer.