2019 - JAMB Chemistry Past Questions and Answers - page 2
11
Which of the following metals is the most essential in the regulation of blood volume, blood pressure and osmotic equilibrium?
A
Zinc
B
Manganese
C
Sodium
D
Iron
12
Which of the following alkaline metals react more quickly spontaneously with water?
A
Calcium
B
Beryllium
C
Magnesium
D
Strontium
13
When chlorine water is exposed to bright sunlight, the following products are formed
A
HCl\(_{(aq)}\) and Cl\(_2\)
B
HOCl\(_{(aq)}\) and Cl\(_2\)
C
HCl\(_{(aq)}\) and O\(_2\)
D
HOCl\(_{(aq)}\) and O\(_2\)
14
Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas?
A
chlorine attacks the starch to give the blue-black color
B
chlorine attacks the iodide ion to give the blue-black color
C
chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color
D
iodine attacks the starch to give the blue-black color
15
Which of the following is a set of neutral oxides?
A
N\(_2\)O, H\(_2\)O, CO
B
N\(_2\)O, SO\(_2\), CO
C
N\(_2\)O, Na\(_2\)O, ZnO
D
N\(_2\)O, SO\(_3\), NO
16
SO\(_3\) is not directly dissolved in water in the industrial preparation of H\(_2\)SO\(_4\) by the contact process because
A
SO\(_3\) is an acidic gas
B
Acid is usually added to water and not water to acid
C
The reaction between SO\(_3\) and water is violently exothermic
D
SO\(_3\) does not dissolve readily in water
17
Which of the following statements does not show Rutherford's account of Nuclear Theory? An atom contains a region
A
which contains protons and neutrons
B
which is positively charged
C
which is massive and can cause deflection of a few projectiles
D
which is very large and in which close to 98% of projectiles pass undeflected
18
Elements X and Y have electronic configurations 1s\(^2\)2s\(^2\)2p\(^4\) and 1s\(^2\)2s\(^2\)2p\(^6\)3s\(^2\)3p\(^1\) respectively. When they combine, the formula of the compound formed is
A
XY
B
X\(_2\)Y
C
Y\(_2\)X\(_3\)
D
X\(_2\)Y\(_3\)
19
By what amount must the temperature of 200cm\(^3\) of Nitrogen at 27°C be increased to double the pressure if the final volume is 150cm\(^3\) (Assume ideality)
A
150°C
B
177°C
C
75°C
D
120°C
20
The combustion of carbon(ii)oxide in oxygen can be represented by equation.
2CO + O\(_2\) → 2CO\(_2\)
Calculate the volume of the resulting mixture at the end of the reaction if 50cm\(_3\) of carbon(ii)oxide was exploded in 100cm\(_3\) of oxygen
A
75cm\(^3\)
B
125cm\(^3\)
C
100cm\(^3\)
D
50cm\(^3\)
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