1993 - JAMB Chemistry Past Questions and Answers - page 4
31
The fraction of crude oil used as jet fuel is?
A
refinery gas
B
diesel oil
C
kerosene
D
gasoline
correct option: c
Users' Answers & Comments32
It is not desirable to use lead tetraethyl as an anti-knock agent because?
A
it is expensive
B
of pollution effects from the exhaust fumes
C
it lowers the octane rating of petrol
D
it is explosive
correct option: b
Users' Answers & Comments33
Al2O3(s) + 3H2SO4(aq) → Al2(SO4(aq)) + 3H2(I)O
Al2O3(s) + 2NaOH(aq)) + 3H2(I)O → 2NaAl(OH)4(aq)).
We can conclude from the equations above that Al2O3(s) is?
Al2O3(s) + 2NaOH(aq)) + 3H2(I)O → 2NaAl(OH)4(aq)).
We can conclude from the equations above that Al2O3(s) is?
A
an acidic oxide
B
an amphoteric oxide
C
a basic oxide
D
a neutral oxide
correct option: b
Users' Answers & Comments34
The carbon atoms on ethane are?
A
sp2 hybridized
B
sp3 hybridized
C
sp2d hybridized
D
sp hybridized
correct option: b
Users' Answers & Comments35
Palm wine turns sour with time because?
A
the sugar content is converted into alcohol
B
the carbon (IV) oxide formed during the fermentation process has a sour taste
C
it is commonly adulterated by the tappers and sellers
D
microbial activity results in the production of orgain acids within it
correct option: d
Users' Answers & Comments36
Catalytic hydrogenation of benzene produces?
A
an aromatic hydrocarbon
B
margarine
C
cyclohexane
D
D.D.T
correct option: c
Users' Answers & Comments37
Which of the following represents saponification?
A
Reaction of carboxylic acids with sodium hydroxide
B
Reaction of alkanoates with acid
C
Reaction of alkanoates with alcohols
D
Reaction of alkanoates with sodium hydroxide
correct option: d
Users' Answers & Comments38
The confirmatory test for alkanoic acids in organic qualitative analysis is the?
A
turning of wet blue litmus paper red
B
reaction with alkanols to form esters
C
reaction with sodium hydroxide to form salt and water
D
reaction with aqueous Na2COsp3 to liberate a gas which turns lime water milky
correct option: b
Users' Answers & Comments39
A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?
A
sulphur (ii) oxide
B
hydrogen sulphide
C
sulphide (lV) oxide
D
hydrogen chloride
correct option: a
Users' Answers & Comments40
A
l
B
ll
C
lll
D
lV
correct option: c
Users' Answers & Comments