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.
200 cm3
400 cm3
600cm3
700cm3
Correct answer is B
2H2(g) + O 2(g) → 2H2Og
2V IV 2V
600cm3 300cm3 600cm3
The volume of hydrogen left over
= 1000 - 600 = 400cm3?
Which of the following salts is not prepared by precipitation?
Lead (ll) trioxocarbonate (lV)
Barium trioxocarbonate (IV)
Sodium trioxocarbnate (IV)
Calcium trioxocarbonate (IV)
Correct answer is C
No explanation has been provided for this answer.
The alloy used extensively in the building industry is
steel
bronze
duralumin
type metal
Correct answer is A
No explanation has been provided for this answer.
Which of the following pairs of salts undergo hydrolysis?
AlCI3 and NH4CI
AICI3 and NaCI
FeCI3 and KCI
Na2SO4 and K2 SO4
Correct answer is A
Salt hydrolysis is a reaction in which one of the ions from a salt reacts with water, forming either an acidic or basic solution.Salts can be hydrolyzed in water, If the salts at least consist of one weak base or weak acid, they can be hydrolyzed. On the other hand, if the salts are from a strong base and acid, they cannot be hydrolyzed.
Al and \(NH_4\) are from weak base \(Al(OH)_3\) and \(NH_4OH\) respectively while Cl is from a strong acid HCl
The method of collection of gases prepared in the laboratory depend on their
odour and atomicity
colour and odour
atomicity and density
solubility and density
Correct answer is D
No explanation has been provided for this answer.
Which of the following equipment is not used to detect radioactivity?
Wilson cloud chamber
Geiger- muller counter
Mass spectrometer
Photographic plate
Correct answer is C
No explanation has been provided for this answer.
A metal X forms two chlorides with the formulae XCI2 and XCI3. Where is X in the Periodic Table?
Group ll
Group llI
d-block
s-block
Correct answer is C
No explanation has been provided for this answer.
One of the characteristics of transition metals is
reducing ability
ductility
ability to conduct electricity
formation of coloured ions
Correct answer is D
No explanation has been provided for this answer.
A nuclide emits a beta-particle (e) in the process, that atomic number
increases by 1 while the mass numer remains constant
decreases by 2 while the mass number remains constant
remains constant while the mass number decreases by 2
remains constant while the mass number increases by 1
Correct answer is A
No explanation has been provided for this answer.
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