2010 - JAMB Chemistry Past Questions and Answers - page 3
21
6AgNO4(aq) + PH3(g) + 3H2O(l) → 6Ag(s) + H3PO3(g) + 6HNO3(aq)
In the above reaction, the reducing agent is
In the above reaction, the reducing agent is
A
HNO3(aq)
B
H2O(l)
C
PH3(g)
D
AgNO3(aq)
correct option: c
Users' Answers & Comments22
The IUPAC nomenclature of the compound LiAlH4 is
A
lithiumtetrahydridoaluminate (III)
B
aluminium tetrahydrido lithium
C
tetrahydrido lithium aluminate (III)
D
lithium aluminium hydride
correct option: a
Users' Answers & Comments23
Iron can be protected from corrosion by coating the surface with
A
gold
B
silver
C
copper
D
zinc
correct option: d
Users' Answers & Comments24
What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s?
[Al = 27, F = 96500 C mol -1]
[Al = 27, F = 96500 C mol -1]
A
0.2 g
B
1.8 g
C
5.4 g
D
14.2 g
correct option: b
Users' Answers & Comments25
In which of the following is the entropy change positive?
A
Thermal dissociation of ammonium chloride
B
Reaction between an acid and a base
C
Addition of concentrated acid to water
D
Dissolution of sodium metal in water
correct option: a
Users' Answers & Comments26
If a reaction is exothermic and there is a great disorder, it means that
A
the reaction is static
B
the reaction is in a state of equilibrium
C
there will be a large increase in free energy
D
there will be a large decrease in free energy
correct option: c
Users' Answers & Comments27
In the preparation of oxygen by heating KClO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by
A
lowering the pressure of the reaction
B
increasing the surface area of the reactant
C
increase the rate of the reaction
D
lowering the energy barrier of the reaction
correct option: d
Users' Answers & Comments28
A
surface area on the rate of reaction
B
catalyst on the rate of reaction
C
pressure on the rate reaction
D
concentration on the rate of reaction
correct option: a
Users' Answers & Comments29
2H2(g) + O2(g) → 2H2O(g) ΔH = -ve
what happens to the equilibrium constant of the reaction above if the temperature is increased?
what happens to the equilibrium constant of the reaction above if the temperature is increased?
A
it is unaffected
B
it becomes zero
C
it decrease
D
it increase
correct option: c
Users' Answers & Comments30
To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed the presence of
A
CO-
B
Cl-
C
SO-
D
NO
correct option: d
Users' Answers & Comments