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Chemistry
UTME / JAMB 1988
Acids, Bases, pH & Salts
Which of the following substances is a basic salt?
A
Na2CO3
B
Mg(OH)CI
C
NaHCO3
D
KSO4.AI2(SO4)3,24H2O
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 #14195)
Chemistry
UTME / JAMB 1988
Oxidation, Reduction & Redox Reactions
Solution
Which of the following acts both s a reducing and an oxidizing agent?
A
H2
B
SO2
C
H2S
D
C
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
SO2 = i.e
In H2SO2 act as oxidizing agent
H2S + SO2 → 3S + 2H2O
Whereas in water SO2 acts as reducing agents H2O + SO2 H2SO23
Source: Myschool Past Questions Archive (Record #14197)
Chemistry
UTME / JAMB 1988
Electrolysis & Electrochemical Cells
Solution
Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?
A
Cu2+ + 2e- → Cu(s)
B
2Cl- -2e → Cl2
C
Cu(s) -2e → Cu2+(aq)
D
Cu2+(aq) + 2Cl-(aq) → CuCl2(aq)
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
During the electrolysis of CuCl\(_2\), the reduction of Cu\(^{2+}\) ions to copper metal (Cu) occurs at the cathode.
This reaction is represented by: Cu\(^{2+}\)(aq) + 2e\(^-\) → Cu(s).
Source: Myschool Past Questions Archive (Record #14198)
Chemistry
UTME / JAMB 1988
Oxidation, Reduction & Redox Reactions
A mixture of starch solution and potassium iodide was placed in a test tube. On adding dilute tetraoxosulphate (lV) acid and then K2Cr2O7 solutions, a blue-black colour was produced. In this reaction, the?
A
iodide is oxidized
B
tetraoxosulphate (Vl) acid acts as an oxidizing agent
C
starch has been oxidized
D
K2Cr2O7 is oxidized
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 #14199)
Chemistry
UTME / JAMB 1988
Reaction Rates & Chemical Equilibrium
Solution
Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na2S2O3(aq) + 2HCl(aq) → 2NaCI(aq) + H2O(I) + SO2(g) + S(g)?
A
A decrease in temperature and an increase in the concentration of the reactants
B
An increase in the temperature and a decrease in the cocentration of the reactants
C
An increase in temperature and an increase in the concentration of the reactants
D
A decrease in the temperature and a decrease in the concentration of the reactants
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The rate of a chemical reaction is governed by the frequency and energy of collisions between reactant particles (Collision Theory). For the reaction between sodium thiosulfate( Na\(_2\)S\(_2\)O\(_3\)) and hydrochloric acid,(HCl). The rate is optimized by the following factors:
- Increasing the temperature increases the average kinetic energy of the particles.
Higher collision frequency: Particles move faster and collide more often.
Greater collision energy: A larger fraction of particles possess energy equal to or greater than the activation energy, leading to more effective collisions.
- Effect of Concentration: Increasing the concentration of the reactants increases the number of particles per unit volume.
Source: Myschool Past Questions Archive (Record #14202)
Chemistry
UTME / JAMB 1988
Chemical Energetics & Thermochemistry
Which of the followingstatements is TRUE?
A
The dissolution of NaOH(s) in water is endothermic
B
The heat os solution of NaOH(s) is positive
C
The NaOH(s) gains heat from the surroundings
D
The heat of solution of NaOH(s) is negative
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 #14203)
Chemistry
UTME / JAMB 1988
Reaction Rates & Chemical Equilibrium
Which property of a reversible reaction is affected by a catalyst?
A
Heat content (enthalphy)
B
Energy of activation
C
Free energy change
D
Equilibrium position
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 #14205)
Chemistry
UTME / JAMB 1988
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following is used in fire extinguishers?
A
Carbon (ll) oxide
B
Carbon (lV) oxide
C
Sulphur (lV) oxide
D
Ammonia
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 #14206)
Chemistry
UTME / JAMB 1988
Stoichiometry, Mole Concept & Volumetric Analysis
When H2S gas is passed into a solution of iron (III) chloride, the colour changes from yellow to green. This is because?
A
H(s)S is reduced to S
B
Fe3+ ions are oxidized by H(s)S
C
Fe3+ ions are oxidized Fe3+ ions
D
Fe3+ ions are reduced to Fe2+ ions
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 #14207)
Chemistry
UTME / JAMB 1988
Stoichiometry, Mole Concept & Volumetric Analysis
Suitable reagents for the laboratory preparation nitrogen are?
A
sodium dioxonitrate (III) and ammonium chloride
B
sodium dioxonitrate (V) and ammonium chloride
C
sodium chloride and ammonium chloride
D
sodium chloride and ammonium diozonitrate (III)
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 #14208)
Chemistry
UTME / JAMB 1988
Stoichiometry, Mole Concept & Volumetric Analysis
The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?
A
nitrogen (ll) oxide
B
nitrogen (l) oxide
C
nitrogen (lV) oxide
D
nitrogen
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 #14209)
Chemistry
UTME / JAMB 1988
Electrolysis & Electrochemical Cells
Chlorine is produced commmercially by?
A
electrolysis of dilute hydrochloric acid
B
electrolysis of brine
C
neutralization of hydrogen chloride
D
heating potassium trioxochlorate (V)
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 #14212)
Chemistry
UTME / JAMB 1988
Metals, Transition Elements & Extraction
Aluminium is extracted commercially from its ore by?
A
heating aluminium oxide with coke in a furance
B
the electrolysis of fused aluminium oxide in cryolite
C
treating cryolite with sodium hydroxide solution under prressure
D
heating sodium aluminium silicate to a high temperature
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 #14214)
Chemistry
UTME / JAMB 1988
Stoichiometry, Mole Concept & Volumetric Analysis
Given the reactions (i) Fe(s) + X(NO3)2(aq) → Fe(NO3) + X(s) (ii) H2(g) + XO → X + H2O(s); X is likely to be?
A
copper
B
zinc
C
calcium
D
lead
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 #14216)
Chemistry
UTME / JAMB 1988
Electrolysis & Electrochemical Cells
Crude copper can be purified by the electrolysis of CuSO4(aq) if?
A
platinum electrodes are used
B
the crude copper is made the anode of the cell
C
the crude copper is made the cathode of the cell
D
crude copper electrodes are used
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 #14217)