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Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?
AGlucose solution
BAqueous copper (ll) tetraoxosulphate (IV)
CDilute sodium chloride solution
DConcentrated hydrochloric acid
EDilute copper (ll) chloride solution
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Question 12
waec1998
What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2O (l)
ADehydrating agent
BOxidising agent
CBleaching agent
DAcid
EPrecipitant
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Question 13
waec1998
Which of the following methods is suitable for the preparation of an insoluble salt?
AAction of an acid on a metal
BDouble decomposition
CNeutralisation
DAction of an acid on a trioxocarbonate (IV)
EAction of an acid on an oxide
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Question 14
waec1998
Which of the following is not a property of trioxonitrate (V) salts?
APositive reaction to the brown ring test
BAbility to dissolve in cold water
CDecomposition on being strongly heated
DProduction of effervescence with saturated Na2CO3 solution
EEvolution of gas with concentrated H2SO4 and copper turnings
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Question 15
waec1998
The following oxides react with water except
ANa2O
BSO3
CNO2
DCO2
ECuO
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Question 16
waec1998
AN AQUEOUS SOLUTION IS ACIDIC IF
Aits pH value is high
Bit s corrosive
Cit changes the colour of litmus
Dit has a bitter taste
Eit contains more H3O- than OH-
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Question 17
jamb1998
In the experiment above, X could be a solution of
Asodium trioxonitrate (V) and ammonium chloride
Bsodium trioxonitrate (lll) and ammonium chloride
Clead (ll) trioxonitrate (V) and copper turnings
Dpotassium trioxonitrate (V) and copper turnings
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Question 18
jamb1998
In the diagram above , the activation energy for the backward reaction is
A+5kJ
B+15KJ
C+25KJ
D+30KJ
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Question 19
jamb1998
The diagram above represents an atom that can combine with chlorine to form
Aa covalent bond
Ban electrovalent bond
Ca hydrogen bond
Da co-ordinate bond
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Question 20
jamb1998
Which of the following is true concerning the properties of benzene and hexane?
ABoth undergo substitution reaction
BBoth undergo addition reaction
CBoth are solids
DBoth can decolourized bromine water
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Question 21
jamb1998
Terylene is synthesized from ethane- 1, 2-diol and benzene - 1, 4-dicarboxylic acid by?
Aaddition reaction
Bcondensation reaction
Celimination reaction
Dsubstitution reaction
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Question 22
jamb1998
An example of aromatic compound is?
AC6H13OH
BC6H13CI
CC6H5OH
DC6H14
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Question 23
jamb1998
How many structural isomers can be drawn for the non-cyclic alkanol with molecular formula C 4H10O?
A1
B2
C3
D4
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Question 24
jamb1998
On cracking medicinal paraffin, a gas is evolved which gives a pop sound with a lighted splinter and an oily liquid which decolourizes bromine solution is also obtained. The products of the cracking are ?
Acarbon (IV) oxide and alkyne
Bcarbon (ll) oxide and alkene
Chydrogen gas and alkene
Dhydrogen gas and alkane
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Question 25
jamb1998
One mole of hydrocarbon contains 6g of hydrogen. If the molecular weight is 54, the hydrocarbon is an?
Aalkanone
Balkane
Calkene
Dalkyne
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Question 26
jamb1998
Alloys are often used in preference to pure metals because?
Ametals are too hard
Bmerals are ductile
Cmetallic properties are improve in alloys
Dalloys are a mixture of metals
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Question 27
jamb1998
A common characteristic shared by iron and aluminium is that both?
Aare extracted by reduction methods
Bform only basic oxides
Cshow oxidation states of +2 and +3
Dform soluble hydroxides
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Question 28
jamb1998
The metal that will react with water only in the form of steam to librate hydrogen gas is?
Acalcium
Baluminium
Ciron
Dzinc
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Question 29
jamb1998
Which of the following is observed when a solution of iron (III) chloride is mixed with a solution of sodium hydroxide?
AA gas is evolved
BA deep blue precipitate is formed
CThe resultant solution turns green turns
DA brown precipitate is formed
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Question 30
jamb1998
The oxide that remains unchanged when heated in hydrogen is?
