1993 - JAMB Chemistry Past Questions and Answers - page 5
41
A
CaSO4
B
KNO3
C
NaCl
D
KCl
correct option: b
Users' Answers & Comments42
A
Cu
B
Fe
C
Ba
D
Zn
correct option: c
Users' Answers & Comments43
A
Increase in temperature
B
Increase in the concentration of a reactant
C
Addition of a catalyst
D
Increase in pressure
correct option: c
Users' Answers & Comments44
A
alcohol and amine
B
acid and amine
C
aldehyde and acid
D
ketone and amine
correct option: b
Users' Answers & Comments45
A
dimethlhexane
B
3,5 dimethylhexane
C
1.1 dmethyl, 3 methylpentane
D
2.4 dimethylhexane
correct option: d
Users' Answers & Comments46
A
dry the gas
B
absorb phosphine impurity
C
absorb ethene impurity
D
from an acetylide with ethyne
correct option: b
Users' Answers & Comments47
The dissolution of common salt in water is a physical change because
A
the salt can be obtained by crystallization
B
the salt can be recovered by the evaporation of water
C
heat is not generated during mixing
D
the solution will not boil at 100oC
correct option: c
Users' Answers & Comments48
At 25oC and 1atm, a gas occupies a volume of 1.50dm3. What volume will it occupy at 100oC and 1atm?
A
1.88 dm3
B
6.00 dm3
C
18.80 dm3
D
18.80 dm3
correct option: a
\(\frac{v_1}{T_1} = \frac{V_2}{T_2}\)
V2 = \(\frac{V_1 \times T_2}{T_1}\)
= \(\frac{1.50 \times 373}{298}\)
= 1.88 dm3
Users' Answers & CommentsV2 = \(\frac{V_1 \times T_2}{T_1}\)
= \(\frac{1.50 \times 373}{298}\)
= 1.88 dm3
49
The fraction of crude oil used as jet fuel is
A
refinery gas
B
diesel oil
C
kerosine
D
gasoline
correct option: c
Users' Answers & Comments