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Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
A given mass of gas occupies 2 dm3 at 300k. At what temperature will its volume be doubled keeping the pressure constant?
A
400 k
B
480 k
C
550 k
D
600 k
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 #13127)
Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following is a measure of the average kinetic energy of the molecules of a substance?
A
volume
B
mass
C
pressure
D
temperature
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 #13133)
Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
If 100 cm3 of oxygen pass through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is?
(O = 16, H = 1)
A
10.0 s
B
12.5 s
C
17.7 s
D
32.0 s
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
100 cm3 of O2 diffuse 50 sec
∴ 100 cm3 of H2 → (100) / (100) x (50) /(1)
t1 50 sec
molecular mass H+ → 2 x 1 = 2
molecular mass of O2 16 x 2 = 32
T2 = t1 √M2/M1 = t2 = 50 √2/32
50√0.625 = 50 x 0.25 = 12.5 secs
Source: Myschool Past Questions Archive (Record #13134)
Chemistry
UTME / JAMB 1992
Kinetic Theory of Matter & Gas Laws
An increase in temperature causes an increase in pressure of a gas in a fixed volume due to an increase in the?
A
number of molecules of the gas
B
density of the gas molecules
C
number of collisions between the gas molecules
D
number of collisions between the gas molecules and the walls of the container
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 #13136)
Chemistry
UTME / JAMB 1992
Chemical Bonding & Intermolecular Forces
Solution
There is a large temperature interval between the melting point and the boiling point of a metal because?
A
metals have very high melting points
B
metals conduct heat very repaidly
C
melting does not break the metalic bond but boiling does
D
the crystal lattice of metals is easily broken
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The significant difference between a metal's melting and boiling points stems from the strength of the metallic bonds and the energy required to break those bonds during phase transitions. Melting involves loosening the attractive forces, while boiling requires complete breakage of those forces, demanding more energy.
Source: Myschool Past Questions Archive (Record #13120)
Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
How many moles of (H+) are there in 1 dm3 of 0.5 M solution of H2SO4?
A
2.0 moles
B
1.0 moles
C
0.5 mole
D
0.25 mole
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
mole = (M x V ) / (1000cm3) = (0.5 x 1000cm3) = 0.5 moles
For H2SO4 → 2H+SO42-
1 mole of H+ = 0.5 moles
2H+ = 2 x 0.5 mole = 1.0 mole
Source: Myschool Past Questions Archive (Record #13121)
Chemistry
UTME / JAMB 1992
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
The nucleus of the isotope tritium, contains?
A
two neutrons with no protons
B
one neutron and one protons
C
two neutrons and one proton
D
two neutrons, one proton and one electron
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The nucleus of tritium contains two neutrons and a proton.
Source: Myschool Past Questions Archive (Record #13138)
Chemistry
UTME / JAMB 1992
Chemical Bonding & Intermolecular Forces
Solution
How many lone pairs of electron are there on the central atom of the H2O molecules?
A
1
B
2
C
3
D
4
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Ref___Google
In a water molecule, oxygen is bonded to two hydrogen atoms. Leaving oxygen with four electrons which pair up with one another to form two lone pairs of electrons.
Source: Myschool Past Questions Archive (Record #13139)
Chemistry
UTME / JAMB 1992
Atomic Structure, Orbitals & Nuclear Chemistry
147N + X → 178O + 11 H. In the above reaction, X is a?
A
neutron
B
helium atom
C
litgium atom
D
deuterium atom
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 #13141)
Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
The pollutants that are likely to be present in an industrial environment are?
A
H2S,SO2 and oxides of nitrogen
B
NH3, HCI and CO
C
CO2, NH3 and H2S
D
dust, NO and CI2
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 #13142)
Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
Four elements P,Q,R and S have 1,2,3, and 7 electrons in their outermost shells respectively. The element which is unlikely to be a metal is?
A
P
B
Q
C
R
D
S
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 #13143)
Chemistry
UTME / JAMB 1992
Air & Environmental Chemistry
Which of the following gases dissolves in water vapour to produce acid rain during rainfall?
A
Oxygen
B
Carbon (II) oxide
C
Nitrogen
D
Sulphur (IV) oxide
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 #13145)
Chemistry
UTME / JAMB 1992
Water, Solutions & Solubility
Water for town supply is chlorinated to make it free from?
A
bad odour
B
bacteria
C
temporary hardness
D
permanent hardness
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 #13146)
Chemistry
UTME / JAMB 1992
Water, Solutions & Solubility
Solution
On which of the following is the solubility of a gaseous substance dependent? I. Nature of solvent II. Nature of solute III. Temperature IV. Pressure
A
I, II, III and IV
B
I and II only
C
II only
D
I, III and IV only
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The solubility of a gas depends on the following; temperature; the higher the temperature the lower the solubility of a gas. pressure; the higher the pressure, the higher the solubility of a gas. others are the nature of solvents and the nature of solutes.
Source: Myschool Past Questions Archive (Record #13148)
Chemistry
UTME / JAMB 1992
Water, Solutions & Solubility
Solution
An emulsion paint consists of ?
A
gas or liquid particles dispersed in liguid
B
liquid particles dispersed in liquid
C
solid particles dispersed in liquid
D
solid particles dispersed in solid
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
An emulsion is a mixture of two immiscible liquids, in emulsion one liquid is dispersed in another liquid. Examples are paint, milk, mayonnaise, cream, etc.
Source: Myschool Past Questions Archive (Record #13150)