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.
What is the mass number of an element having 20 neutrons, 15 protons and 15 electrons?
15
30
35
50
Correct answer is C
Mass number = Protons = Neutrons = 15 + 20 = 35
The electronic configuration of an element X is 1s22s 22s63p 2 3p4. It can be deduced that X
Belongs to group 6 of the Periodic Table
Belongs to group IV of the Periodic Table
has 3 unpaired electrons in its atom
has relative molecular mass of 16
Correct answer is A
No explanation has been provided for this answer.
Which of the following measures is not suitable for controlling water pollution?
treating industrial effluent and domestic sewage before discharge into water
Controlling the use of agrochemicals
recycling industrial and agricultural wastes
burning industrial and agricultural wastes before discharge into water ways
Correct answer is D
No explanation has been provided for this answer.
lower the temperature
increase the concentration
facilitate the precipitation of solid
reduce the viscosity of the solution
Correct answer is C
No explanation has been provided for this answer.
Which of the following pollutants is biodegradable?
Domestic sewage
Metal scraps
Radioactive waste
Plastic foil
Correct answer is A
No explanation has been provided for this answer.
l and ll only
lll and IV only
ll, lll, and IV only
l, ll, lll, and IV only
Correct answer is D
No explanation has been provided for this answer.
What is the product Cx Hy in the following equation? \(C_{10}H_{22}\) → \(C_{8}H_{18}\) + CxHy
butene
octane
ethene
decane
Correct answer is C
\(C_{10}H_{22}\) → \(C_{8}H_{18}\) + CxHy
\(C_{10}H_{22}\) → \(C_{8}H_{18}\) + (\(C_2H_4\)) ⇒⇒ Ethene.
WHICH OF THE FOLLOWING PETROLEUM FRACTIONS YIELDS VASELINE AND PARAFFIN WAX ON REDISTILLATION?
DIESEL OIL
LUBRICATION OIL
PETROL
KEROSENE
Correct answer is B
No explanation has been provided for this answer.
Which of the following reactions will be affected by change in pressure at equilibrium?
X(g) + Y(g) ⇌ W(g) + Z(g)
X(g) + 2Y(g) ⇌W(g) + Z(g)
2X(g) ⇌ W(g) + Z(g)
2Y(g) ⇌ W(g) + Z(g)
Correct answer is B
No explanation has been provided for this answer.
The key factor to be considered in siting a chemical industry is
favourable climatic conditions
the availability of space to store raw materials
its nearness to other industrial establishments
its nearness to the source of raw materials
Correct answer is D
No explanation has been provided for this answer.
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