2004 - JAMB Chemistry Past Questions and Answers - page 4
31
Which of the following gases can be collected by the method of downward delivery?
A
Chlorine
B
Oxygen
C
Ammonia
D
Hydrogen
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32
When steam is passed over red-hot carbon, the substances produced are
A
Hydrogen and trioxocarbonate (IV) acid
B
Hydrogen, oxygen and carbon (IV) oxide
C
Hydrogen and carbon (II) oxide
D
Hydrogen and carbon (IV) oxide
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33
Sulphur (IV) oxide bleaches by
A
Reduction
B
Oxidation
C
Hydration
D
Adsorption
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34
Carbon is tetravalent because
A
The electrons in both the 2s and 2p orbitals are equivalent
B
The electrons in all the orbitals of carbon are equivalent
C
The 2s and 2p atomic orbitals hybridize
D
All the atomic orbitals of carbon hybridize
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35
Aluminium hydroxide is used in the dyeing industry as a
A
Salt
B
Dye
C
Mordant
D
Dispersant
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36
Alloys are best prepared by
A
Electroplating
B
Arc-welding
C
Reducing and mixture of their metallic oxide
D
Cooling a molten mixture of the metals
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37
Transition metals possess variable oxidation states because they have
A
Electrons in the d orbitals
B
Electron in the s orbitals
C
A variable number of electrons in the p orbitals
D
Partially filled p orbitals
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38
Sodium metal is always kept under oil because it
A
Readily reacts with water
B
Is reduced by atmospheric nitrogen
C
Reacts vigorously on exposure to air
D
Reacts with oxygen and carbon (IV) oxide
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39
Oxyacetylene flame is used for iron-welding because it
A
Makes the iron metals solidify very quickly
B
Combines with oxygen to give a pop sound
C
Evolves a lot of heat when burnt
D
Dissociates to produce carbon (IV) oxide and oxygen
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40
The alkyl group can be represented by the general formula
A
CnH2n+1
B
CnH2n
C
CnH2n+2
D
CnH2n-2
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