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Chemistry
UTME / JAMB 2012
Atomic Structure, Orbitals & Nuclear Chemistry
A hydrogen atom which has lost an electron contains
A
one proton only
B
one neutron only
C
one proton and one neutron
D
one proton, one electron and one neutron
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 #27471)
Chemistry
UTME / JAMB 2012
Atomic Structure, Orbitals & Nuclear Chemistry
The electronic configuration of Mg 2+ is
A
ls 22s 22P 63s23P2
B
Is22s22P6
C
ls22s22p63s2
D
ls22s22P4
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 #27472)
Chemistry
UTME / JAMB 2012
Periodic Table & Periodicity
Group VII elements are
A
monoatmic
B
good oxidizing agents
C
highly electropositive
D
electron donors
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 #27473)
Chemistry
UTME / JAMB 2012
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following is used to study the arrangement of particles in crystal lattices?
A
Alpha-particles
B
Beta-particles
C
Gamma-rays
D
X-rays
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 #27474)
Chemistry
UTME / JAMB 2012
Periodic Table & Periodicity
I. It has a varied composition from one place to another. ll. it constituents can be separated by physical means
lll. It contains unreactive noble gases
which of the above shows that air is a mixture?
A
I and ll only
B
ll and lll only
C
l and lll only
D
l,ll and lll
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 #27475)
Chemistry
UTME / JAMB 2012
Water, Solutions & Solubility
The chemicals used to soften hard water involves the addition of
A
insoluble sodium compounds which from soluble solutions of calcium and magesium
B
solube soudium compounds which from soluble solutions of calcium and magnesium ions
C
solube sodium compounds which from insoluble precipitates of calcium and magnesium ions
D
insoluble precipitates of calcium and magnesium ions
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 #27476)
Chemistry
UTME / JAMB 2012
Water, Solutions & Solubility
Chlorination of water for town supply is carried out to
A
make the water colourless
B
remove germs from the water
C
make the water tastedful
D
remove odour from the water
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 #27477)
Chemistry
UTME / JAMB 2012
Water, Solutions & Solubility
The solubilites of different solutes in a given solvent can be compared by
A
plotting their solubility curves on separete axes
B
plotting their solubility curves on the same axes
C
plotting some of the solubility curves on the x-axis and others on the y-axis
D
plotting their solubility curves on the x-axis only
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 #27478)
Chemistry
UTME / JAMB 2012
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Potassium trioxochlorate (V)has a solubility of 1.5 mol dm -3 at 45 oC.On cooling this solution to a temperature of 20 oC, the solubility was found to be 0.5 mol dm -3. What mass of KCIO 3 was crystalized out?
[K = 39, Cl = 35.5 O =16]
A
1.00g
B
10.00g
C
12.25g
D
122.50g
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Given:
Solubility of KClO\(_3\) @ 45\(^0\)C = 1.5 moldm\(^{-3}\)
Solubility of KClO\(_3\) @ 20\(^0\)C = 0.5 moldm\(^{-3}\)
Difference in Solubility = 1.5 moldm\(^{-3}\) - 0.5 moldm\(^{-3}\) = 1.0 moldm\(^{-3}\)
Recall that Solubility = \(\frac{mass}{Molar mass}\times 1 dm^3\)
Also, Molar mass of KClO\(_3\) = 39 + 35.5 + (16 x 3) = 122.5g
Solubility = \(\frac{mass}{Molar mass}\times 1 dm^3\)
1.0 = \(\frac{mass}{122.5}\times 1 dm^3\)
Mass = 1.0 x 122.5 = 122.5g
Source: Myschool Past Questions Archive (Record #27479)
Chemistry
UTME / JAMB 2012
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
Which of the following pollutants is associated with brain damage?
A
Carbon (ll) oxide
B
Radioactive fallout
C
Biodegradable waste
D
Sulphus (lV) oxide
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The correct answer is A.
CO (Carbon Monoxide) and also other pollutants like Particulate Matter (PM), Nitrogen Dioxide (NO2), and heavy metals, are pollutants linked to cause brain disorder.
Carbon Monoxide (CO): exposure linked to increased risk of neurological disorders, including dementia and Parkinson's disease.
Source: Myschool Past Questions Archive (Record #27480)
Chemistry
UTME / JAMB 2012
Acids, Bases, pH & Salts
Which of the following will produce a solution with pH less than 7 at equivalent point?
A
HNO 3 +NaOH
B
H 2SO 4 + KOH
C
HCL +Mg (OH) 2
D
HNO 3 + KOH
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 #27481)
Chemistry
UTME / JAMB 2012
Acids, Bases, pH & Salts
Solution
The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its
A
basicity
B
acid strength
C
pH
D
concentration
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The basicity of an acid is the number of replaceable Hydrogen ions, \(H^+\), or Hydroxonium ion, \(H_{3}O^{+}\) in one molecule of the acid.
Source: Myschool Past Questions Archive (Record #27482)
Chemistry
UTME / JAMB 2012
Stoichiometry, Mole Concept & Volumetric Analysis
During a titration experiment, 0.05 moles of carbon (lV) oxide is liberated. What is the volume of gas liberated?
A
22.40 dm 3
B
11.20 dm 3
C
2.24 dm 3
D
1.12 dm 3
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 #27483)
Chemistry
UTME / JAMB 2012
Water, Solutions & Solubility
A major factor considered in selecting a suitable method for preparing a simple salt is its
A
Crystalline from
B
melting point
C
reactivity with dilute acids
D
solubility in water
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 #27484)
Chemistry
UTME / JAMB 2012
Oxidation, Reduction & Redox Reactions
The oxidation number of boron in NaBH 4 is
A
-3
B
-1
C
+1
D
+3
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 #27485)