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1992 - JAMB Chemistry Past Questions and Answers - page 1

1

There is a large temperature interval between the melting point and the boiling point of a metal because?

A
metals have very high melting points
B
metals conduct heat very repaidly
C
melting does not break the metalic bond but boiling does
D
the crystal lattice of metals is easily broken
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2

How many moles of (H+) are there in 1 dm3 of 0.5 M solution of H2SO4?

A
2.0 moles
B
1.0 moles
C
0.5 mole
D
0.25 mole
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3

wH2SO4 + xAI(OH)3 → yH2O + = zAI2(SO4)3. The respective values of w.x.y and z in the equation above are?

A
2,2,5 and 1
B
3,2,5 and 2
C
3,2,6 and 1
D
2,2,6 and 2
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4

A given mass of gas occupies 2 dm3 at 300k. At what temperature will its volume be doubled keeping the pressure constant?

A
400 k
B
480 k
C
550 k
D
600 k
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5

Which of the following is a measure of the average kinetic energy of the molecules of a substance?

A
Volume
B
Mass
C
pressure from age grades
D
Temperature
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6

If 100 cm3 of oxygen pass through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is?



(O = 16, H = 1)

A
10.0 s
B
12.5 s
C
17.7 s
D
32.0 s
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7

An increase in temperature causes an increase in pressure of a gas in a fixed volume due to an increase in the?

A
number of molecules of the gas
B
density of the gas molecules
C
number of collisions between the gas molecules
D
number of collisions between the gas molecules and the walls of the container
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8

The nucleus of the isotope tritium, contains?

A
two neutrons with no protons
B
one neutron and one protons
C
two neutrons and one proton
D
two neutrons, one proton and one electron
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9

How many lone pairs of electron are there on the central atom of the H2O molecules?

A
1
B
2
C
3
D
4
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10

147N + X → 178O + 11 H. In the above reaction, X is a?

A
neutron
B
helium atom
C
litgium atom
D
deuterium atom
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