1997 - WAEC Chemistry Past Questions and Answers - page 4
31
Which of the substance lettered P to V in the equation below would be left on the filter paper if the reaction mixture were filtered? P (aq) + Q(aq) → V(s) + R(aq) + T(g)
A
P
B
Q
C
V
D
T
Ask EduPadi AI...
32
When chlorine is added to slaked lime, the product obtained is
A
bleaching powder
B
chlorinated water
C
hydrochloric acid
D
oxochlorate (l) acid
Ask EduPadi AI...
33
Which of the following when heated strongly in air will leave a metal as residue?
A
Sodium trioxonitrate (V)
B
Potassium trioxonitrate (V)
C
Silver trioxonitrate (V)
D
Lead (ll) trrioxonitrate(V)
Ask EduPadi AI...
34
Which of the following is used as water softener?
A
Na2CO3.10H2O
B
CuSO4. 5H2O
C
MgSO4. 7H2O
D
CaCI2.2H2O
Ask EduPadi AI...
35
The following oxides react with both acids and bases to form salts except
A
zinc oxide
B
lead (ll) oxide
C
aluminium oxide
D
tin (IV) oxide
Ask EduPadi AI...
36
Which of the following metals is not extracted by electrolysis ?
A
lron
B
Sodium
C
Calcium
D
Magnesium
Ask EduPadi AI...
37
Which of the following is an ore of aluminium?
A
Haematite
B
Magnetite
C
Siderite
D
Bauxite
Ask EduPadi AI...
38
Lead and tin are the components of
A
steel
B
bronze
C
brass
D
dentist amalgam
Ask EduPadi AI...
39
An atom 17 protons, 17 electrons and 18 neutrons has a mass number of
A
17
B
18
C
34
D
35
Ask EduPadi AI...
40
If an element R belongs to the same group as sodium, an aqueous solution of ROH will
A
be neutral
B
be acidic
C
be coloured
D
have pH greater than 7
Ask EduPadi AI...