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.
Soap lather is an example of a colloid in which a?
liquid is dispersed in gas
solid is dispersed in liquid
gas is dispersed in liquid
liquid is despersed in liquid
Correct answer is C
No explanation has been provided for this answer.
52.0g
58.5g
85.5g
88.5g
Correct answer is A
Molar mass of MgCl2 = 95g
The solubility of MgCl2 is 8.0/dm3
1 dm3 = 1000cm3
Solubility of g/cm3
8 x 95 → 1000cm3
x → 50
x = (50)/(1000) x (8 x 95) / (1) = 38g
Mass of the salt left undissolved = 90 - 38 = 52.0g
yzX + 10n → y - 1z + 1X
yzX + 10n → y + 1zX
yzX + 10n → yz + 1X
yzX + 10n → y + 1z - 1X
Correct answer is B
No explanation has been provided for this answer.
carbon (IV) oxide, nitrogen and the rare gases
nitrogen and the rare gases
carbon (IV) oxide, nitrogen (IV) oxide and the rare gases
carbon (IV) oxide
Correct answer is B
So phosphorus will remove oxygen by forming P205, KOH will absorb water vapors, and sulfuric acid will react with carbon dioxide thus removing it from the mixture. So nitrogen and rare gases will be left
The soil around a battery manufacturing factory is likely to contain a high concentration of?
Ca2+ salts
Pb2+ salts
Mg2+ salts
Al3+ salts
Correct answer is B
No explanation has been provided for this answer.