1995 - WAEC Chemistry Past Questions and Answers - page 3
21
In which of the following processes are larger molecules broken down into smaller molecules?
A
Vulcanization of rubber
B
Hydrogenation of palm oil
C
Hydrolysis of starch
D
Polymerization
correct option: c
Users' Answers & Comments22
The following alkanols will yield alkanoic acids on reacting with excess acidified K2Cr2O7 except
A
CH3CH2OH
B
(CH3)2CHCH2OH
C
(CH3)3CCH2OH
D
(CH3)3COH
correct option: d
Users' Answers & Comments23
Which of the following is an alloy of mercury?
A
Stainless steel
B
Soft solder
C
Coinage bronze
D
Amalgam
correct option: d
Users' Answers & Comments24
The function of limestone in the extraction of iron in the blast furnace is
A
removal of the earthly impurities
B
decomposition of the iron ore
C
conversion of iron (lll) to iron (ll) compounds
D
generation of heat for the process
correct option: a
Users' Answers & Comments25
Metals which react with steam only when they are red-hot include
A
copper
B
sodium
C
calcium
D
gold
correct option: e
Users' Answers & Comments26
Copper (ll) tetraoxosulphate (VI) is often added to swimming pools because it
A
prevents the growth of algae
B
coagulates suspended particles
C
neutralizes dissolved gases in water
D
reacts with any excess chlorine present
correct option: a
Users' Answers & Comments27
The following salts dissolve readily in cold water except
A
CaCI2
B
PbSO4
C
(NH4)2SO4
D
Na2CO3
correct option: b
Users' Answers & Comments28
What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
A
0.1 mole
B
0.2mole
C
0.3 mole
D
1.0 mole
correct option: c
Users' Answers & Comments29
What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
A
0.1 mole
B
0.2mole
C
0.3 mole
D
1.0 mole
correct option: c
Users' Answers & Comments