1998 - WAEC Chemistry Past Questions and Answers - page 2
11
Which of the following can be added to dissolve the precipitate formed in the reaction represented by the following equation? CaCl2(aq) + H2C2O 4(s) ⇌ CaC 2O2
A
Calcium chloride solution
B
Concentrated hydrochloric acid
C
Ethanol
D
Ethanedioc acid
Ask EduPadi AI for a Detailed Answer
12
The spontaneity of a chemical reaction is determined by the change in the
A
concentration of the reactants
B
temperature of the system
C
free energy of the system
D
pressure applied to the system
Ask EduPadi AI for a Detailed Answer
13
Two metallic ions commonly present in hard water are
A
Ca2+ and Zn2+
B
Cu2+ and Na+
C
Mg2+ and Ca2+
D
Fe2+ and Na+
Ask EduPadi AI for a Detailed Answer
14
Rusting of iron is an example of
A
deliquescence
B
decomposition
C
displacement reaction
D
redox reaction
Ask EduPadi AI for a Detailed Answer
15
Aluminium is extracted from
A
magnetite
B
cryolite
C
bauxite
D
cassiterite
Ask EduPadi AI for a Detailed Answer
16
Metals are said to be malleable because they
A
are good conductors heat
B
are good conductors of electricity
C
can be beaten into sheets
D
can be alloyed
Ask EduPadi AI for a Detailed Answer
17
A device used in the laboratory for intermittent production of gases without heating is
A
Leibing condenser
B
aspirator
C
delivery tube
D
inverted funnel
Ask EduPadi AI for a Detailed Answer
18
Which of the following can undergo both addition reactions and substitution reactions?
A
Benzene
B
Pentane
C
Propene
D
Hexane
Ask EduPadi AI for a Detailed Answer
19
The liquid product of the destructive distillation of coal is
A
kerosene
B
ethanol
C
ammoniacal liquor
D
paraffin oil
Ask EduPadi AI for a Detailed Answer
20
Which of the following alkanes has the highest boiling point?
A
pentane
B
ethane
C
propane
D
butana
Ask EduPadi AI for a Detailed Answer