2010 - JAMB Chemistry Past Questions and Answers - page 2
11
A noble gas with a high power of fog penetration used in aerodrome beacons is
A
krpton
B
argon
C
helium
D
neon
correct option: d
Users' Answers & Comments12
Permanent hardness of water can be removed by
A
filtration
B
adding slaked lime
C
adding caustic soda
D
boiling
correct option: c
Users' Answers & Comments13
Substance employed as drying agents are usually
A
amphoteric
B
hydroscopic
C
efflorescent
D
acidic
correct option: b
Users' Answers & Comments14
Calculate the solubility in mol dm-3 of 40g of CuSO4 dissolved in 100g of water at 120oC.
[Cu = 64, S = 32, O = 16]
[Cu = 64, S = 32, O = 16]
A
4.00
B
2.50
C
0.40
D
0.25
correct option: b
Users' Answers & Comments15
Coffee stains can best be removed by
A
Kerosine
B
turpentine
C
a solution of borax in water
D
ammonia solution
correct option: c
Users' Answers & Comments16
Carbon (II) oxide is considered dangerous if inhaled mainly because it
A
can cause injury to the nervous system
B
competes with oxygen in the blood
C
competes with carbon (IV) oxide in the blood
D
can cause lung cancer
correct option: b
Users' Answers & Comments17
The acid that is used to remove rust is
A
boric
B
hydrochloric
C
trioxonitrate (V)
D
tetraoxosulphate (VI)
correct option: b
Users' Answers & Comments18
Calculate the volume of 0.5 mol dm-3 H2So4 that is neutralized by 25 cm3 of 0.1 mol dm-3 NaOH
A
5.0 cm3
B
2.5 cm3
C
0.4 cm3
D
0.1 cm3
correct option: b
Users' Answers & Comments19
The colour of methyl orange in alkaline medium is
A
yellow
B
pink
C
orange
D
red
correct option: a
Users' Answers & Comments20
Which of the following salts is slightly soluble in water?
A
AgCl
B
CaSO4
C
Na2CO3
D
PbCl2
correct option: c
Users' Answers & Comments