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Physics
UTME / JAMB 1986
Equilibrium of Forces, Moments & Flotation
Diagram
Solution
A uniform meter rule QR is balanced on a knife edge which is 55cm from R, when a mass of 10g is hung at P as shown above, the mass of the meter rule is
Attached Figure / Diagram
A
550g
B
350g
C
70g
D
35g
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Taking a moment about the support.
m(55 - 50) = 10(90 - 55)
5 m = 10 x 35
5 m = 350
m = \(\frac{350}{5}\) = 70g
Source: Myschool Past Questions Archive (Record #41657)
Physics
UTME / JAMB 1986
Elasticity, Density, Pressure & Fluids
Diagram
fig 1 is a graph of force against extension for a spiral spring, the force constant of the spring is given by the
Attached Figure / Diagram
A
slope of the linear prtion of the graph
B
length of the linear portion of the graph
C
area under the linear portion of the graph
D
area under the entire graph
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #41658)
Chemistry
UTME / JAMB 1986
Acids, Bases, pH & Salts
Which of the following salts when dissolved in water will NOT give the corresponding pH value?
A
NaHSO4, pH < 5
B
Na2CO3, pH > 8
C
Na2Cl,pH = 7
D
NaHCO, pH < 6
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 #14144)
Chemistry
UTME / JAMB 1986
Acids, Bases, pH & Salts
Solution
Which of the following is an acidic salt?
A
NaHSO4
B
Na2SO4
C
CH3CO2Na
D
Na2S
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
A salt formed by the neutralisation of a strong acid and weak base is called acidic salt because its aqueous solution turns blue litmus red.
Source: Myschool Past Questions Archive (Record #14145)
Chemistry
UTME / JAMB 1986
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following solutions will conduct the least amount of electricity?
A
2.00 M aqueous solution of NaOH
B
0.01 M aqueous solution of NaOH
C
0.01 M aqueous solution of hexanoic acid
D
0.01 M aqueous solution of sugar
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 #14147)
Chemistry
UTME / JAMB 1986
Electrolysis & Electrochemical Cells
Solution
How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?
A
3.90 x 102 coulombs
B
5.50 x 103 coulombs
C
6.54 x 103 coulombs
D
2.34 x 104 coulombs
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
How many coulombs of electricity ⇒ Quantity of electricity = Q
Recall that Q = I x t
= 6.5 x (1 x 60 x 60)
= 23400 C
= 2.34 x 10\(^4\) C
Source: Myschool Past Questions Archive (Record #14148)
Chemistry
UTME / JAMB 1986
Oxidation, Reduction & Redox Reactions
Which of these represents a redox reaction?
A
AgNO3 + NaCl → AgCAl + NaNO3
B
H2S + Pb(NO3) → PbS + 2HNO3
C
CaCO3 → CaO + CO2
D
Zn + 2HCl → ZnCl2 + H2
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 #14149)
Chemistry
UTME / JAMB 1986
Acids, Bases, pH & Salts
Solution
20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH?
A
-51.O KJ mol-
B
+57.3 KJ mol-
C
+57.O KJ mol-
D
+51.0 KJ mol-
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
NH4OH = 20cm of 0.1 m
NH4 + HCl → NH4Cl = H2O
Heat of Neutralization of NH4OH
= \(\frac{-102}{2}\) = -51.0 KJ mole-1
Source: Myschool Past Questions Archive (Record #14152)
Chemistry
UTME / JAMB 1986
Reaction Rates & Chemical Equilibrium
Solution
What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)?
A
The equilibrium is driven to the left
B
The equilibrium is driven to the right
C
There is no effect
D
More ZnO is produced
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
According to Le Chatelier's Principle, increasing the pressure on a system at equilibrium will cause the equilibrium to shift toward the side with the fewer number of moles of gas to counteract the change.
ZnO(s) + H\(_2\)(g) → Zn(s) + H\(_2\)O(I)
Reactant side: Contains 1 mole of gas (H\(_2\)). Solid ZnO does not contribute to gas pressure.
Product side: Contains 0 moles of gas. Both Zn is a solid and H\(_2\)O is a liquid in this specific equation.
Result: Since the product side has fewer moles of gas (0 vs 1), increasing the pressure drives the equilibrium to the right (forward direction).
Source: Myschool Past Questions Archive (Record #14153)
Chemistry
UTME / JAMB 1986
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The approximate volume of air containing 10cm3 of oxygen is?
A
20 cm3
B
25 cm3
C
50 cm3
D
100 cm3
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Volume of air containing 10 cm O2 is
(100 x 10)/(20) = 50cm3
Source: Myschool Past Questions Archive (Record #14154)
Chemistry
UTME / JAMB 1986
Stoichiometry, Mole Concept & Volumetric Analysis
The reaction Mg + H2O → MgO + H2 takes place only in the presence of?
A
excess Mg ribbon
B
excess cold water
C
very hot water
D
steam
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 #14155)
Chemistry
UTME / JAMB 1986
Non-Metals & Their Compounds
Solution
When steam is passed through red hot carbon, which of the following are produced?
A
Hydrogen oxygen and carbon (IV) oxide
B
Hydrogen and carbon (IV) oxide
C
Hydrogen and carbon (II) oxide
D
Hydrogen and trioxocarbonate (IV) acid
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
When steam is passed through red hot carbon (like coke), the products formed are carbon monoxide (CO) and hydrogen gas H\(_2\), which is commonly referred to as "water gas". This reaction occurs because the high heat breaks the bonds in the water molecule, allowing the oxygen to react with the carbon to form carbon monoxide, while the hydrogen is released as a gas.
Chemical equation: C (s) + H\(_2\)O (g) → CO (g) + H\(_2\) (g).
Source: Myschool Past Questions Archive (Record #14157)
Chemistry
UTME / JAMB 1986
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?
A
CO and SO3
B
CO and SO2
C
CO,SO2 and SO3
D
CO and H2S
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
When fuels containing sulphur are burned, sulphur compounds in the fuel are oxidised to sulphur dioxide while carbon compound are oxidized to carbon monoxide
Source: Myschool Past Questions Archive (Record #14159)
Chemistry
UTME / JAMB 1986
Air & Environmental Chemistry
Oxygen-demanding waste are considered to be a water pollutant because they?
A
deplete oxygen which is necessary for the survival of aquatic organism
B
increase oxygen which is necessary for survival of aquatic organism
C
increase other gaseous substances which are necessary for the survival of aquatic organisms
D
deplete other gaseous species which is necessary for the survival of aquatic organisms
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 #14160)
Chemistry
UTME / JAMB 1986
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following will react further with oxygen to form higher oxide?
A
NO and H2O
B
CO and CO2
C
SO2 and NO
D
CO2 and H2O
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 #14161)