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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)
Chemistry
UTME / JAMB 1992
Acids, Bases, pH & Salts
Solution
A sample of orange juice is found to have a pH of 3.80. What is he concentration of the hydroxide ion in the juice?
A
1.6 x 10-4
B
6.3 x 10-11
C
6.3 x 10-4
D
1.6 x 10-11
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
pH + pOH = 14
3.80 + pOH = 14
pOH = 14 - 3.80
pOH = 10.2
Recall that pOH = - log [ OH\(^-\)]
10.2 = - log [ OH\(^-\)]
[ OH\(^-\)] = 10\(^{-10.2}\)
[ OH\(^-\)] = 6.3 x 10\(^{-11}\)
Source: Myschool Past Questions Archive (Record #13157)
Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
Arrange HCI, CH3COOH, C6H5CH3 in order of increasing conductivity.
A
HCI, CH3COOH, C6H5CH3
B
C6H5CH3, HCI, CH3COOH
C
C6H5CH3, CH3COOH, HCI
D
CH3COOH, C6H5CH3, HCI
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 #13158)
Chemistry
UTME / JAMB 1992
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
How many grams of H2SO4 are necessary for the preparation of 0.175 dm3 of M 6.00 M H2SO4?
(S = 32.06, O = 16.00 H = 1.00)
A
206.0 g
B
103.0 g
C
98.1 g
D
51.5 g
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
1 mole of H2SO4 ≈ 98 gms
0.175 dm3 of 6.0 m H2SO4
1000 cm3 ≈ dm3
(0.175) / (1000) of 6.0 m H2SO4
0.000175 x 6 x 98 ≈ 0.1029 gms
1 dm3 - 1000 cm3
∴ 0.1029 x 1000 = 103 gms
Source: Myschool Past Questions Archive (Record #13198)
Chemistry
UTME / JAMB 1992
Electrolysis & Electrochemical Cells
Copper (II) tetraoxosulphate (VI) solution is electrolyzed using carbon electrodes. Which of the following are produced at the anode and cathode respectively ?
A
Copper and oxygen
B
Oxygen and copper
C
Hydrogen and copper
D
Copper and hydrogen
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 #13199)
Chemistry
UTME / JAMB 1992
Electrolysis & Electrochemical Cells
Solution
Calculate the mass, in kilograms, of magnesium produced by the electrolysis of magnesium (II) chloride in a cell operating for 24 hours at 500 amperes.
A
2.7
B
5.4
C
10.8
D
21.7
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Mg + 2e → 24 gms
2f → 24 gms
2 x 96,500 → 24 gms
Q = (500 x 1440 x 60)
Q = 4320000 C
1 mole of mg = (1) / (2 x 96,500) x (43200000) / (1)
= (24)/(1) = (1036800000) / (193000) = 5372.020725 gms
in leg = (5372.020725) / (1000) = 5.4 leg
Source: Myschool Past Questions Archive (Record #13201)