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Chemistry
UTME / JAMB 1995
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
A liquid begins to boil when?
A
its vapour pressure is equal to the vapour pressure of its solid at the given temperature
B
molecules start escaping from its surface
C
its vapour pressure equals the atmosphere pressure
D
its volume is sightly increased
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The normal boiling point is the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure.
Source: Myschool Past Questions Archive (Record #13627)
Chemistry
UTME / JAMB 1995
Water, Solutions & Solubility
Deliquescent substances are also?
A
efflorescent
B
anhydrous
C
hygroscopic
D
insoluble
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 #13635)
Chemistry
UTME / JAMB 1995
Organic Chemistry I: Hydrocarbons & Crude Oil
When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain?
A
ethane
B
chlorine
C
hydrogen chloride
D
ethene
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 #13636)
Chemistry
UTME / JAMB 1995
Water, Solutions & Solubility
The difference between colloides and and suspensions is brought out clearly by the fact that while colloids?
A
do not scatter light, suspensions do
B
can be separated by filtration, suspension cannot be so separated
C
can be separated by a membrane, suspensions cannot
D
do not settle out on standing, suspensions do
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 #13639)
Chemistry
UTME / JAMB 1995
Acids, Bases, pH & Salts
Neutralization involves a reaction between H3O+ and?
A
CI-
B
OH-
C
NO3-
D
CO32-
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 #13646)
Chemistry
UTME / JAMB 1995
Atomic Structure, Orbitals & Nuclear Chemistry
In the oil drop experiment, Millikan determined the?
A
charge to mass ratio of the electron
B
mass of the electron
C
charge of the electron
D
mass of the proton
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 #13629)
Chemistry
UTME / JAMB 1995
Periodic Table & Periodicity
The ability of ionic solids is generally due to the?
A
negative electron affinity of most atoms
B
crystal lattice forces
C
electron pair sharing
D
positive ionization potentials
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 #13630)
Chemistry
UTME / JAMB 1995
Atomic Structure, Orbitals & Nuclear Chemistry
Which of the following statements is FALSE about isotopes of the same element?
A
They have the same number of electrons in their outermost shells
B
They have different atomic masses
C
They have the same atomic number and the number of electrons
D
They have the same atomic number but different number of electrons
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 #13631)
Chemistry
UTME / JAMB 1995
Stoichiometry, Mole Concept & Volumetric Analysis
Helium is often used in observation balloons because it is?
A
light and combustible
B
light and non-combustible
C
heavy and combustible
D
heavy and non-combustible
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 #13632)
Chemistry
UTME / JAMB 1995
Electrolysis & Electrochemical Cells
Solution
In the process of silver-plating a metal M, the metal M is the?
A
anode and a direct current is used
B
cathode and an alternating current is used
C
anode and an alternating current is used
D
cathode and a direct current is used
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Plating requires ions to flow through an electrolyte in an electric field. Positive ions flow with the electric field, negative ions against the electric field. This electric field comes from a DC supply connected to the electrodes. While silver plating, Ag is the anode while the metal to be coated is the cathode.
Source: Myschool Past Questions Archive (Record #13652)
Chemistry
UTME / JAMB 1995
Stoichiometry, Mole Concept & Volumetric Analysis
How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)?
(F = 96 500 C mol-)
A
0.5
B
1.0
C
1.5
D
3.0
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 #13656)
Chemistry
UTME / JAMB 1995
Electrolysis & Electrochemical Cells
2CL-(aq) → CI2(g) + 2e-(aq). The above half-cell reaction occuring at the anode during the electrolysis of dilute ZnCI2 solution is?
A
ionization
B
oxidation
C
reduction
D
recombination
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 #13660)
Chemistry
UTME / JAMB 1995
Oxidation, Reduction & Redox Reactions
Which of the following is a redox reaction?
A
KCI(aq) + H2SO4(aq) → KHSO4(aq) + HCI(aq)
B
2FeBr2(aq) + Br4(aq) → 2FeBr3(aq)
C
3AgNO(aq) + FeCl3(aq) → 3AgCl(aq) + Fe(NO3)3(aq)
D
H2CO3(aq) → H2O(I)2- + CO2(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 #13666)
Chemistry
UTME / JAMB 1995
Oxidation, Reduction & Redox Reactions
Solution
Cr\(_2\)O\(_7\)\(^{2-}\)(aq) + 14H\(^+\)(aq) + 6l\(^-\)(aq) → 2Cr\(^{3+}\)(aq) + 3l(g) + 7H\(_2\)O(I).
The change in the oxidation number of oxygen in the equation above is?
A
0
B
1
C
2
D
7
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The change in oxidation number is from Cr\(_2\)O\(_7\)\(^{2-}\) to H\(_2\)O
The oxidation number of Oxygen in Cr\(_2\)O\(_7\)\(^{2-}\) is -2, while the oxidation number of Oxygen in H\(_2\)O is -2.
Change means final - initial = -2 - (-2)
= - 2 + 2 = 0
Therefore, the change in oxidation number of oxygen is 0
Source: Myschool Past Questions Archive (Record #13671)
Chemistry
UTME / JAMB 1995
Stoichiometry, Mole Concept & Volumetric Analysis
If an equilibrium reaction has ∆H < O, the reaction will proceed favorably in the forward reaction at?
A
low temperatures
B
high temperatures
C
all temperatures
D
all pressures
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 #13672)