1995 - WAEC Chemistry Past Questions and Answers - page 2
11
Sodium chloride cannot conduct electricity in the solid state because it
A
is a normal salt
B
is highly soluble in water
C
is an electrovalent compound
D
does not have any effect on litmus
correct option: e
Users' Answers & Comments12
What mass of copper will be deposited by the liberation of Cu2+ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]
A
64g
B
32g
C
12.8g
D
6.4g
correct option: e
Users' Answers & Comments13
What mass of copper will be deposited by the liberation of Cu2+ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]
A
64g
B
32g
C
12.8g
D
6.4g
correct option: e
Users' Answers & Comments14
Which of the following is not correct of the reaction represented by the equation below? 2C(s) + O2(g) → 2CO(g); ∆H = - xKJ
A
there is an increase in entropy ;
B
There is anincrease in gaseous volume
C
Carbon (lV) oxide is produced
D
The oxidation number of carbon increases from 0 to +2
correct option: c
Users' Answers & Comments15
H3O+(aq) + OH-(aq) → 2H2O(l). The heat change accompanying the process represented by the equation above is the heat of
A
neutralization
B
formation
C
solution
D
dilution
correct option: a
Users' Answers & Comments16
The following statements about graphite are correct except that it
A
is used as a lubricant
B
has a network structure
C
contains mobile free electrons
D
is good conductor
correct option: b
Users' Answers & Comments17
Which of the following is hydrocarbons is unsaturated?
A
Ethane
B
Benzene
C
Propane
D
2 - methylbutane
correct option: b
Users' Answers & Comments18
The following can be obtained directly from the destructive distillation of coal except
A
ammoniacal liquor
B
coke
C
producer gas
D
coal gas
correct option: c
Users' Answers & Comments19
Fructose and glucose are classified as carbohydrates because they
A
are crystalline white solids
B
are energy -giving substances
C
are naturally occurring organic compounds
D
contain carbon oxygen and hydrogen
correct option: e
Users' Answers & Comments20
The gas produced when a mixture of sodium propanoate and soda lime is heated is
A
methane
B
pentane
C
ethane
D
butene
correct option: c
Users' Answers & Comments