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Chemistry Past Questions

Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.

26 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

26 questions
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Question 1 of 6 26 total questions
Question 11
waec 1998
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
waec 1998
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
waec 1998
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
waec 1998
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
waec 1998
The following oxides react with water except
ANa2O
BSO3
CNO2
DCO2
ECuO
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Question 16
waec 1998
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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