2012 - JAMB Chemistry Past Questions and Answers - page 2
11
Which of the following is used to study the arrangement of particles in crystal lattices?
A
Alpha-particles
B
Beta-particles
C
Gamma-rays
D
X-rays
correct option: d
Users' Answers & Comments12
I. It has a varied composition from one place to another. ll. it constituents can be separated by physical means
lll. It contains unreactive noble gases
which of the above shows that air is a mixture?
lll. It contains unreactive noble gases
which of the above shows that air is a mixture?
A
I and ll only
B
ll and lll only
C
l and lll only
D
l,lll and lll
correct option: a
Users' Answers & Comments13
The chemicals used to soften hard water involves the addition of
A
insoluble sodium compounds which from soluble solutions of calcium and magesium
B
solube soudium compounds which from soluble solutions of calcium and magnesium ions
C
solube sodium compounds which from insoluble precipitates of calcium and magnesium ions
D
insoluble precipitates of calcium and magnesium ions
correct option: c
Users' Answers & Comments14
Chlorination of water for town supply is carried out to
A
make the water colourless
B
remove germs from the water
C
make the water tastedful
D
remove odour from the water
correct option: b
Users' Answers & Comments15
The solubilites of different solutes in a given solvent can be compared by
A
plotting their solubility curves on separete axes
B
plotting their solubility curves on the same axes
C
plotting some of the solubility curves on the x-axis and others on the y-axis
D
plotting their solubility curves on the x-axis only
correct option: b
Users' Answers & Comments16
Potassium trioxochlorate (V)has a solubility of 1.5 mol dm -3 at 45 oC.On cooling this solution to a temperature of 20 oC, the solubility was found to be 0.5 mol dm -3. What mass of KCIO 3 was crystalized out?
[K = 39, Cl = 35.5 O =16]
[K = 39, Cl = 35.5 O =16]
A
1.00g
B
10.00g
C
12.25g
D
122.50g
correct option: d
Users' Answers & Comments17
Which of the following pollutants is associated with brain damage?
A
Carbon (ll) oxide
B
Radioactive fallout
C
Biodegradable waste
D
Sulphus (lV) oxide
correct option: b
Users' Answers & Comments18
Which of the following will produce a solution with pH less than 7 at equivalent point?
A
HNO 3 +NaOH
B
H 2SO 4 + KOH
C
HC +Mg (OH) 2
D
HNO 3 + KOH
correct option: c
Users' Answers & Comments19
The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its
A
basicity
B
acid strength
C
pH
D
concentration
correct option: b
Users' Answers & Comments20
During a titration experiment, 0.05 moles of carbon (lV) oxide is liberated. What is the volume of gas liberated?
A
22.40 dm 3
B
11.20 dm 3
C
2.24 dm 3
D
1.12 dm 3
correct option: d
Users' Answers & Comments