1997 - JAMB Chemistry Past Questions and Answers - page 1
1
35 cm3 of hydrogen was sparked with 12 cm3 of oxygen at 110°C and 760mm Hg to produce steam. What percentage of the total volume of gas left after the reaction is hydrogen?
A
11%
B
31%
C
35%
D
69%
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2
2.85g of an oxide of copper gave 2.52g of copper on reduction and 1.90g of another oxide gave 1.52g of copper on reduction. The data above illustrates the law of?
A
constant composition
B
conservation of mass
C
reciprocal proportions
D
multiple proportions
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3
An element, X, forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic mass of X is?
(H = 1)
(H = 1)
A
34.0
B
31.0
C
20.0
D
14.0
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4
A mixture of 0.20 mole of Ar, 0.20 mole of N2 and 0.30 mole of He exerts a total pressure of 2.1 atm. The partial pressure of He in the mixture is?
A
0.90 atm
B
0.80 atm
C
0.70 atm
D
0.60 atm
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5
The temperature of a body decreases when drops of liquid placed on it evaporate because?
A
the atmospheric vapour pressure has a cooling effect on the body
B
a temperature gradient exists between the drops of liquid and the body causing the latter to vaporate
C
the heat of vapourization is drawn from the body causing it to cool
D
the random motion of the liquid molecules causes a cooling effect on the body
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6
The electron configuration of two elements with similar chemical properties are represented by?
A
1s22s22p5 and 1s22s22p4
B
1s22s22p4 and 1s22s22p63s1
C
1s22s22p63s1 and 1s22s1
D
1s22s22p4 and 1s22s1
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7
In the periodic table, what is the property that decreases along the periodic and increases down the group?
A
Atomic number
B
Electron affinity
C
Ionization potential
D
Atomic radius
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8
Two elements, P and Q with atomic numbers 11 and 8 respectively , combine chemically to form the compound PxQY. The respective values of x and y are?
A
1 and 1
B
1 and 2
C
2 and 1
D
3 and 1
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9
Oxygen is a mixture of two isotopes O and O with relative abundances of 90% and 10% respectively. The relative atomic mass of oxygen is?
A
16.0
B
16.2
C
17.0
D
18.0
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10
If 30cm3 of oxygen diffuses through porous plug in 7s, how long will it take 60 cm3 of chlorine to diffuse through the same plug?
A
12s
B
14s
C
21s
D
30s
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