2016 - JAMB Chemistry Past Questions and Answers - page 4
31
An example of a solid emulsion is
A
Butter
B
Hair cream
C
Milk
D
Cod-liver oil
correct option: a
Users' Answers & Comments32
An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is
A
16
B
15
C
31
D
46
correct option: b
Users' Answers & Comments33
Calculate the volume in cm3 of oxygen evolved at s.t.p when a current of 5A is passed through acidified water for 193s?
[F = 96500 C mol1. Molar volume of a gas at s.t.p = 22.4dm3]
[F = 96500 C mol1. Molar volume of a gas at s.t.p = 22.4dm3]
A
0.056dm3
B
0.224dm3
C
224.000dm3
D
56.000dm3
correct option: a
Q = 193 x 5 = 965C
40H \(\mapsto\) 2H2O + O2 + 4e
4 x 96500C = 22.4dm3
965C = x
x = \(\frac{22.4 \times 965}{4 \times 96500}\)
= 0.056dm3
Users' Answers & Comments40H \(\mapsto\) 2H2O + O2 + 4e
4 x 96500C = 22.4dm3
965C = x
x = \(\frac{22.4 \times 965}{4 \times 96500}\)
= 0.056dm3
34
The gas that is used for the treatment of cancer is
A
Neon
B
Radon
C
Xenon
D
Argon
correct option: b
Users' Answers & Comments35
A chemical reaction in which the hydration energy is greater than the lattice energy is referred to as
A
A reversible reaction
B
A spontenous reaction
C
An endothermic reaction
D
An exothermic reaction
correct option: b
Users' Answers & Comments36
MnO4(aq) + Y 5Fe2+ (aq) \(\mapsto\) Mn2+ (aq) + 5Fe 2+ (aq) + 4H2O(1)
In the equation above, Y is
In the equation above, Y is
A
10H+ (aq)
B
5H+ (aq)
C
8H+ (aq)
D
4H+ (aq)
correct option: c
Users' Answers & Comments37
A
Geometric isomerism
B
Positional isomerism
C
Structural isomerism
D
Optical isomerism
correct option: d
Users' Answers & Comments38
n monosaccharide \( \underset{Q}{\stackrel{P}{\rightleftharpoons}} \) polysaccharide -n water.
In the process above, P and Q respectively represent
In the process above, P and Q respectively represent
A
Condensation and hydrolysis
B
Fermentation and condensation
C
Polymerization and hydrolysis
D
Polymerization and condensation
correct option: a
Users' Answers & Comments39
A
Alkene and halo-group
B
Hydroxyl and chloro-group
C
Alkene and chloro-group
D
Hydroxyl and halo-group
correct option: b
Users' Answers & Comments40
A
Enthalphy
B
Activated complex
C
Activation energy
D
Enthalphy change
correct option: d
Users' Answers & Comments