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Chemistry
UTME / JAMB 1989
Organic Chemistry I: Hydrocarbons & Crude Oil
The combustion of ethene, C 2H 4, is given by the equation C 2H 4 + 30 2 → 2CO2 + 2H2 O; ∆H = - 1428 KJ. If the molar heats of formation of water and carbon (IV) oxide are - 286 kJ and - 396 kJ respectively, calculate the molar heat of formation of ethene in KJ
A
- 2792
B
+ 2792
C
- 64
D
+ 64
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 #27577)
Chemistry
UTME / JAMB 1989
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following represents the balanced equation for the reaction of copper with concentrated trioxonitrate (V) acid?
A
Cu (s) + 2HNO 3(aq) → Cu (NO 3) 2(aq) + H 2(g)
B
Cu (s) + 4HNO 3(aq) → Cu (NO 3) 2(aq) + 2H 2O (1) + 2NO 2(g)
C
3Cu (s) + 8HNO3(aq) → 3Cu (NO3)2(aq) + 4H2O(1) + 2NO(g)
D
3Cu(s) + 4HNO3(aq) → 3Cu(NO 3) 2(aq) + 2H 2O (1) + 2NO (g)
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 #27578)
Chemistry
UTME / JAMB 1989
Non-Metals & Their Compounds
The catalyst used in the contact process for the manufacture of tetraoxosulphate (VI) acid is
A
manganes (IV) oxide
B
manganese (ll) tetraoxosulphate (VI)
C
vanadium (V) oxide
D
iron metal
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 #27579)
Chemistry
UTME / JAMB 1989
Non-Metals & Their Compounds
Solution
Some products of destructive distillation of coal are?
A
carbon (IV) oxide and ethanoic acid
B
trioxocarbonate (IV) acid and methanoic acid
C
producer gas and water gas
D
coke and ammoniacal liquor
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Heating coal, in the absence of air, is known as destructive distillation of coal. It yields various useful products like coke, coal gas, coal tar, and ammoniacal liquor.
Source: Myschool Past Questions Archive (Record #27581)
Chemistry
UTME / JAMB 1989
Stoichiometry, Mole Concept & Volumetric Analysis
Gunpower is made from charcoal, sulphur and potassium trioxonitrate (V) The salt in the mixture performs the function of
A
an oxidant
B
a reductant
C
a solvent
D
a catalyst
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 #27583)
Chemistry
UTME / JAMB 1989
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Which of the following reactions is (are) feasible?
I Br (l) + 2CI\(_2\)(aq) → 2Br(aq) + CI\(_2\)(g)
ll 2 I (aq) + Br\(_2\)(L) → 2Br (aq) + I\(_2\)(s)
lll 2F (aq) + CI\(_2\)(g) → 2CI (aq) + F\(_2\)(g)
IV 2F(aq) + Br\(_2\)(l) → 2Br (aq) + F\(_2\)(g)
A
l
B
ll
C
l and lll
D
lll and lV
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
After considering all the options, the only feasible reaction is with option II. This is because that is the only reaction where Bromine being more electronegative or more reactive than Iodine can displace Iodine to become an aqueous solution. In every other, Fluorine is more reactive than Chlorine and bromine, therefore, they cannot displace Fluorine, as seen in options III and IV. Also, Chlorine being more reactive than Bromine cannot be displaced by Bromine as seen in I. Hence the only option with the reaction being feasible is with II only.
Source: Myschool Past Questions Archive (Record #27585)
Chemistry
UTME / JAMB 1989
Non-Metals & Their Compounds
Bleaching powder, CaOCI2, H2O, deteriorates on exposure to air because
A
it loses its water of crystallization
B
atmospheric nitrogen displaces chlorine from it
C
carbon (IV) oxide of the atmosphere displaceschlorine from it
D
bleaching agents should be stored in solution
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 #27587)
Chemistry
UTME / JAMB 1989
Non-Metals & Their Compounds
The products of the thermal decomposition of ammonium trioxonitrate (V) are
A
NO 2 and oxygen
B
NH3 and oxygen
C
nitrogen and water
D
N2O and water
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 #27588)
Chemistry
UTME / JAMB 1989
Stoichiometry, Mole Concept & Volumetric Analysis
The scale of a chemical balance is made of iron plate and coated with copper electrolytically because
A
iron is less susceptible to corrosion than copper
B
copper is twice as less susceptitible to corrosion as iron
C
copper is less susceptible to corrosion than iron
D
copper and iron are equally susceptible to corrosion
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 #27590)
Chemistry
UTME / JAMB 1989
Electrolysis & Electrochemical Cells
A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is
A
copper
B
aluminium
C
zinc
D
sodium
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 #27591)
Chemistry
UTME / JAMB 1989
Stoichiometry, Mole Concept & Volumetric Analysis
Mortar is NOT used for under-water construction because
A
it hardens by lose of water
B
its hardening doe not depend upon evaporation
C
it requires concrete to harden
D
it will be washed away by the flow of water
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 #27592)
Chemistry
UTME / JAMB 1989
Oxidation, Reduction & Redox Reactions
Which of the following is NOT involved in the extraction of metals from their ores?
A
reduction with carbon
B
reduction with other metals
C
reduction by electrolysis
D
oxidation with oxidizing agents
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 #27593)
Chemistry
UTME / JAMB 1989
Organic Chemistry I: Hydrocarbons & Crude Oil
When excess chlorine is mixed with ethene at room temperature, the product is
A
1,2 - dichloroethane
B
1,2 - dichloroethene
C
1,1 - dichloroethane
D
1, 1 - dichloroethene
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 #27594)
Chemistry
UTME / JAMB 1989
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Vulcanization of rubber is a process by which
A
isoprene units are joined to produce rubber
B
rubber latex is coagulated
C
sulphur is chemically combined in the rubber
D
water is removed from the rubber
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 #27595)
Chemistry
UTME / JAMB 1989
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The reaction between ethanoic acid and sodium hydroxide is an example of
A
esterification
B
neutralization
C
hydroxylation
D
hydrolysis
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 #27596)