2015 - JAMB Chemistry Past Questions and Answers - page 2
11
Which of the noble gases has the greatest ionization energy
A
He
B
Xe
C
Ar
D
Rr
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12
The weakest attractive force that can be observed between two molecules is
A
ionic
B
covalent
C
co-ordinate covalent
D
vander Waals
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13
An elements used in production of matches is
A
nitrogen
B
aluminum
C
copper
D
sulphur
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14
Cathode rays cause an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays
A
are positively charged
B
are negatively charged
C
Have mass
D
travel in straight lines
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15
Flow of current in electrolytes is due to the movement of
A
electrons
B
Holes and electron
C
Ions
D
Charges
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16
A suitable reagent for distinguish between ethanoic and ethanol is
A
bromine water
B
Fehling’s solution
C
sodium hydrogen trioxocarbonate (iv)
D
Ammoniacal silver trioxonitrate(V)
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17
In the discovery of protein, the instrument used is
A
cathode ray tube
B
glass tube and discharge tube
C
discharge tube with terminal cathode
D
discharge tube with central cathode
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18

A
chlorine
B
nitrogen
C
calcium
D
neon
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19
Which of the following metals burns with brick red
A
Pb
B
Ca
C
Na
D
Mg
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20
In the production of soap, concentrated sodium chloride solution is added to
A
increase the solubility of soap
B
decrease the solubility of the soap
C
saponify the soap
D
emulsify the soap
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