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Chemistry
UTME / JAMB 1998
Stoichiometry, Mole Concept & Volumetric Analysis
The metal that will react with water only in the form of steam to librate hydrogen gas is?
A
calcium
B
aluminium
C
iron
D
zinc
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #13925)
Chemistry
UTME / JAMB 1998
Oxidation, Reduction & Redox Reactions
A common characteristic shared by iron and aluminium is that both?
A
are extracted by reduction methods
B
form only basic oxides
C
show oxidation states of +2 and +3
D
form soluble hydroxides
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #13926)
Chemistry
UTME / JAMB 1998
Metals, Transition Elements & Extraction
Alloys are often used in preference to pure metals because?
A
metals are too hard
B
merals are ductile
C
metallic properties are improve in alloys
D
alloys are a mixture of metals
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #13927)
Chemistry
UTME / JAMB 1998
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
One mole of hydrocarbon contains 6g of hydrogen. If the molecular weight is 54, the hydrocarbon is an?
A
alkanone
B
alkane
C
alkene
D
alkyne
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
CxH6
∴ CxH6 = 54
12x + 6 = 54
12x = 54 - 6
12x = 48
x = (48)/(12)
x = 4
We have CxH6 butyne
A formular of alkyne
Source: Myschool Past Questions Archive (Record #13929)
Chemistry
UTME / JAMB 1998
Organic Chemistry I: Hydrocarbons & Crude Oil
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 ?
A
carbon (IV) oxide and alkyne
B
carbon (ll) oxide and alkene
C
hydrogen gas and alkene
D
hydrogen gas and alkane
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #13933)
Chemistry
UTME / JAMB 1998
Stoichiometry, Mole Concept & Volumetric Analysis
How many structural isomers can be drawn for the non-cyclic alkanol with molecular formula C 4H10O?
A
1
B
2
C
3
D
4
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #13934)
Chemistry
UTME / JAMB 1998
Stoichiometry, Mole Concept & Volumetric Analysis
An example of aromatic compound is?
A
C6H13OH
B
C6H13CI
C
C6H5OH
D
C6H14
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #13936)
Chemistry
UTME / JAMB 1998
Organic Chemistry I: Hydrocarbons & Crude Oil
Terylene is synthesized from ethane- 1, 2-diol and benzene - 1, 4-dicarboxylic acid by?
A
addition reaction
B
condensation reaction
C
elimination reaction
D
substitution reaction
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #13938)
Chemistry
UTME / JAMB 1998
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
Which of the following is true concerning the properties of benzene and hexane?
A
Both undergo substitution reaction
B
Both undergo addition reaction
C
Both are solids
D
Both can decolourized bromine water
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Hexane and benzene can both partake in substitution reactions.
Source: Myschool Past Questions Archive (Record #13940)
Chemistry
UTME / JAMB 1998
Chemical Bonding & Intermolecular Forces
Diagram
The diagram above represents an atom that can combine with chlorine to form
Attached Figure / Diagram
A
a covalent bond
B
an electrovalent bond
C
a hydrogen bond
D
a co-ordinate bond
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #31547)
Chemistry
UTME / JAMB 1998
Reaction Rates & Chemical Equilibrium
Diagram
Solution
In the diagram above , the activation energy for the backward reaction is
Attached Figure / Diagram
A
+5kJ
B
+15KJ
C
+25KJ
D
+30KJ
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
For the backward reaction, the activation energy = 40kJ - 15kJ = +25kJ
Source: Myschool Past Questions Archive (Record #31549)
Chemistry
UTME / JAMB 1998
Acids, Bases, pH & Salts
Diagram
Solution
In the experiment above, X could be a solution of
Attached Figure / Diagram
A
sodium trioxonitrate (V) and ammonium chloride
B
sodium trioxonitrate (lll) and ammonium chloride
C
lead (ll) trioxonitrate (V) and copper turnings
D
potassium trioxonitrate (V) and copper turnings
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Nitrogen is prepared in the laboratory by heating an equimolar aqueous solution of ammonium chloride and sodium nitrite. The ammonium nitrite formed as a result of a double decomposition reaction, decomposes to form nitrogen gas.
\(NH_4Cl_{(aq)}+NaNO_{2(aq)} → NH_4NO_{2(aq)}+NaCl_{(aq)}\)
\(NH_4NO_{2(aq)} →N_{2(g)} +2H_2O_{(l)}\).
(source: understanding chemistry by G O Ojukuku)
Source: Myschool Past Questions Archive (Record #31559)
Chemistry
UTME / JAMB 1998
Acids, Bases, pH & Salts
Solution
In the experiment above, X could be a solution of
A
sodium trioxonitrate (V) and ammonium chloride
B
sodium trioxonitrate (lll) and ammonium chloride
C
lead (ll) trioxonitrate (V) and copper turnings
D
potassium trioxonitrate (V) and copper turnings
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Nitrogen is prepared in the laboratory by heating an equimolar aqueous solution of ammonium chloride and sodium nitrite. The ammonium nitrite formed as a result of a double decomposition reaction, decomposes to form nitrogen gas.
\(NH_4Cl_{(aq)}+NaNO_{2(aq)} → NH_4NO_{2(aq)}+NaCl_{(aq)}\)
\(NH_4NO_{2(aq)} →N_{2(g)} +2H_2O_{(l)}\).
(source: understanding chemistry by G O Ojukuku)
Source: Official Exam / Past Question Archive
Chemistry
WAEC / WASSCE 1998
Acids, Bases, pH & Salts
AN AQUEOUS SOLUTION IS ACIDIC IF
A
its pH value is high
B
it s corrosive
C
it changes the colour of litmus
D
it has a bitter taste
E
it contains more H3O- than OH-
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #36609)
Chemistry
WAEC / WASSCE 1998
Stoichiometry, Mole Concept & Volumetric Analysis
The following oxides react with water except
A
Na2O
B
SO3
C
NO2
D
CO2
E
CuO
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #36611)