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2018 - JAMB Chemistry Past Questions and Answers - page 8

71

An element X forms the following compounds with chlorine; XCl\(_4\), XCl\(_3\), XCl\(_2\). This illustrates the

A
law of multiple proportions
B
law of chemical proportions
C
law of simple proportions
D
law of conservation of mass
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72

The hydrogen ion concentration of a sample of orange juice is 2.0 X 10\(^{-11}\)moldm\(^{-3}\). What is its p\(^{OH}\)? [log102 = 0.3010]

A
3.30
B
13.00
C
10.70
D
11.30
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73
A correct electrochemical series can be obtained from Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging
A
Al and Mg
B
Zn and Fe
C
Zn and Pb
D
Pb and H
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74

2SO\(_2\) \(_{(g) }\)+ O\(_2\) \(_{(g) }\) ↔ 2SO\(_3\)\(_{(g) }\) ΔH = -395.7kJmol\(^{-1}\)
In the equation, an increase in temperature will shift the equilibrium position to the

A
left and equilibrium constant decreases
B
left and equilibrium constant increases
C
right and equilibrium constant increases
D
right and equilibrium constant decreases
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75

The end products of burning a candle in the atmosphere are water and 

A
carbon (II) oxide
B
sulphur (IV) oxide
C
carbon (IV) oxide
D
sulphur (VI) oxide
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76

The collision theory explains reaction rates in terms of

A
size of the product
B
frequency of collision of the reactants
C
size of reactant
D
frequency of collision of the products
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77

The presence of ammonia gas in a desiccator can exclusively be removed by

A
phosphorus (V) oxide
B
fused calcium chloride
C
calcium chloride
D
concentrated tetraoxosulphate (VI) acid
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78

Aluminium does not react with either dilute or concentrated trioxonitrate (V) acid because

A
it is insoluble in either dilute or concentrated trioxonitrate (V) acid
B
it is lower than hydrogen in the electrochemical series
C
the reaction with trioxonitrate (V) acid has a light activation energy
D
an insoluble oxide is formed on its surface which renders it passive
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79

Which of these sources of water may likely contain the least concentration of Ca\(^{2+}\) and Mg\(^{2+}\)?

A
Spring water
B
River water
C
Tap water
D
Sea water
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80

The conductivity of an acid solution depends on the

A
amount of ions present and their mobilities
B
mobilities of the ions present
C
amount of ions present
D
temperature of the solution
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