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.
Which of these properties gives a solid its definite shape?
strong intermolecular attraction
high melting point
high boiling point
weak intermolecular attraction
Correct answer is A
No explanation has been provided for this answer.
The shape of the hydrocarbon compound CH4 is
square planar
planar
linear
tetrahedral
Correct answer is D
No explanation has been provided for this answer.
How many moles of limestone will be required to produce 5.6g of CaO?
[Ca = 40, C = 12, O= 16]
0.20 mol
0.10 mol
1.12 mol
0.56 mol
Correct answer is B
CaCO3 → CaO + CO2
CaCO3 = 40 + 12 + 16 * 3 = 100, CaO = 40 + 16 = 56
56gt of CaO was produced by 100g of CaCO3
∴ 5.6g of CaO will produce by
(5.6 * 100)/56 = 10g of CaCO3
moles = mass/molar mass = 10/100 = 0.10m
Natural water collected from rivers and ponds contain oxygen, carbon (IV) oxide and
nitrogen
hydrogen
chlorine
sulphur
oxide
Correct answer is A
No explanation has been provided for this answer.
The gas that is the most dangerous pollutant to human is
sulphur (IV) oxide
carbon (IV) oxide
nitrogen (II) oxide
hydrogen sulphide
Correct answer is D
No explanation has been provided for this answer.