2019 - JAMB Chemistry Past Questions and Answers - page 5
41
Which of the following is a physical change?
A
Exposing white phosphorus to air
B
Burning kerosene
C
Dissolving calcium in water
D
Freezing ice cream
42
In the reaction between sodium hydroxide and tetraoxosulphate (VI) solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralize 10cm\(^3\) of 1.25 molar tetraoxosulphate (vi) acid?
A
25cm\(^3\)
B
10cm\(^3\)
C
20cm\(^3\)
D
50cm\(^3\)
43
Sulphur exists in six forms in the solid state. This property is known as
A
Isomerism
B
Allotropy
C
Isotopy
D
Isomorphism
44
In the reaction:
M + N → P
ΔH = +Q kJ
Which of the following would increase the concentration of the product?
A
Adding a suitable catalyst
B
Increasing the concentration of P
C
Increasing the temperature
D
Decreasing the temperature
45
A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180. Find the molecular formula.
[H = 1, C = 12, O = 16]
A
C\(_3\)H\(_6\)O\(_3\)
B
C\(_6\)H\(_6\)O\(_3\)
C
C\(_6\)H\(_{12}\)O\(_6\)
D
CH\(_2\)O
46
The IUPAC nomenclature of the compound
H\(_3\)C - CH(CH\(_3\)) - CH(CH\(_3\)) - CH\(_2\) - CH\(_3\)
A
3,4- dimethylhexane
B
2,3- dimethyl pentane
C
2- ethyl hexane
D
2,3- dimethylhexane
47
Which of the following gases contains the least number of atoms at s.t.p?
A
1 mole of butane
B
4 moles of chlorine
C
3 moles of ozone
D
7 moles of argon
48
What mass of magnesium would be obtained by passing a current of 2 amperes for 2 hours 30 mins, through molten magnesium chloride?
[1 faraday = 96500C, Mg = 24]
A
1.12g
B
4.48g
C
1.80g
D
2.00g
49
Which important nitrogen-containing compound is produced in Haber's process?
A
NH\(_3\)
B
NO\(_2\)
C
NO
D
HNO\(_3\)
50
Elements in the periodic table are arranged in the order of their
A
atomic numbers
B
metallic character
C
mass number
D
relative atomic mass
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