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.
The earthly impurities in iron ore are removed in the blast furnace by the reaction
CO2 + C →2CO
Fe2O3 + 3CO →2Fe + 3CO2
SiO2 + CaO →CaSiO3
CaCO3 → CaO + CO2
C +CO2 → CO2
Correct answer is C
No explanation has been provided for this answer.
30cm3
60cm3
90cm3
120cm3
180cm3
Correct answer is D
No explanation has been provided for this answer.
Which of the following statements best explains cracking ? It is a process
in which an alkene adds on itself repeatedly to form long chain polymers
in which large hydrocarbon molecules are broken into smaller units
for measuring theoctane number of petrol
in which carbon chain results in a zigzag arrangement
in which aromatic hydrocarbons are produced
Correct answer is B
No explanation has been provided for this answer.
Which of the following reactions represents the laboratory preparation of hydrogen?
C(s) + H 2 O(l) → CO(g) + H2(g)
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
Cu(s) + H2O(l) → CuO(s) + H2(g)
2AI(s) + 3H2O(l) → Al2O3(s) + 3H2(g)
Correct answer is C
No explanation has been provided for this answer.
The major raw material in a plastic industry is
ethanol
sulphur
methylethanoate
ethene
ethane
Correct answer is D
- Earlier, molasses act as a raw material which yield ethanol from which ETHENE (gotten is used to) produce a range of poly(ethene) plastics.
- Nowadays, starting new raw materials are obtained by the fractional distillation of crude oil or petroleum.
- During the thermal cracking of petroleum; long chain alkanes are converted into smaller chain alkanes, ALKENES (with Ethene being the predominate), etc.
- The Alkenes such as Ethene and Propene can be made into Poly(ethene) / plastic, nylon, etc.