2005 - JAMB Chemistry Past Questions and Answers - page 2
11
What will happen if an aluminium spoon is used to stir a solution of iron (II) trioxonitrates (V)?
A
The spoon will be oxidized while the iron (II) ions will be reduced to the metal
B
The spoon will increase in size
C
The spoon will be reduced while the iron (II) ions will be oxidized
D
The spoon will be reduced
correct option: a
Users' Answers & Comments12
The enzymes responsible for converting sucrose into two simple isomeric sugars is
A
maltase
B
amylase
C
invertase
D
lactase
correct option: c
Users' Answers & Comments13
The decolourization of purple colour of tetraoxomanganate (VII) ion is a test for
A
alkenes
B
alkanols
C
alkanals
D
alkanes
correct option: a
Users' Answers & Comments14
Which of the following are structural isomers?
A
propanoic acid and propan-1, 2-diol
B
Propanal and propanone
C
Ethanoic acid and propanoic acid
D
Ethan-1, 2-diol and ethanoic acid
correct option: b
Users' Answers & Comments15
In the purification of impure samples of ethyl ethanoate synthesized by esterification, concentrated sodium trioxocarbonate (IV) solution is used to remove
A
water
B
basic impurities
C
acidic impurities
D
ethoxyethane
correct option: c
Users' Answers & Comments16
How many hydrogen atoms does a single ring cycloalkane have less than the corresponding open-chain alkane?
A
Two
B
Three
C
Four
D
One
correct option: a
Users' Answers & Comments17
Equal moles of ethyne and hydrogen iodide react to give
A
CH2 = CH2
B
CH2 - CHI
C
CH3 - CI
D
CH2 = CHI
correct option: d
Users' Answers & Comments18
A substance that is used as a ripening agent for fruits is
A
ethene
B
propene
C
methane
D
butane
correct option: a
Users' Answers & Comments19
When water boilers are used for long period of time, the solid substances left behind as scale are
A
magnesium trioxosilicate (IV) and rust
B
magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI)
C
clay and magnesium troxosulphate (IV)
D
clay and rust
correct option: a
Users' Answers & Comments20
25cm3 of a mixture of nobel gases was obtained from air after the removal of other constituents. What was the original volume of air
A
2,500 cm3
B
1250 cm3
C
125 cm3
D
80 cm3
correct option: a
Percentage of noble gases in air is 1%
25 = (1/100) * T
∴ T = 25 * 100 = 2500 cm3
Users' Answers & Comments25 = (1/100) * T
∴ T = 25 * 100 = 2500 cm3