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Chemistry
UTME / JAMB 2011
Atomic Structure and Periodic Table
What type of bond exits between an element X with atomic number 12 and Y with atomic number 17?
A
Electrovalent
B
Metallic
C
Covalent
D
Dative
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 #4770)
Chemistry
UTME / JAMB 2011
Acids, Bases, and Salts
Solution
Hardness of water is mainly due to the presence of
A
calcium hydroxide or magnesium hydroxide
B
calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)
C
sodium hydroxide or magnesium hydroxide
D
calcium chloride or sodium chloride salts
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Salts of Calcium and Magnesium are responsible for hardness of water. Bicarbonates, Carbonates, Chlorides and Sulfates of Calcium and Magnesium causes temporary and permanent hardness.
Source: Myschool Past Questions Archive (Record #4771)
Chemistry
UTME / JAMB 2011
Acids, Bases, and Salts
Solution
A suitable solvent for iodine and naphthalene is
A
carbon (IV) sulphide
B
ethanol
C
water
D
benzene
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Both Iodine and Naphthalene, being nonpolar compounds, dissolve best in nonpolar or slightly polar solvents like benzene, toluene, and carbon disulfide.
Source: Myschool Past Questions Archive (Record #4772)
Chemistry
UTME / JAMB 2011
Acids, Bases, and Salts
Solution
Which of the following noble gases is commonly found in the atmosphere?
A
Xenon
B
Neon
C
Helium
D
Argon
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Argon, with the symbol Ar which is the third noble gas, in group 18 makes up about 1% of the Earth's atmosphere, making it the most common noble gas on Earth.
Source: Myschool Past Questions Archive (Record #4773)
Chemistry
UTME / JAMB 2011
Matter & Separation Techniques
N2O4(g) ↔ 2NO2(g) ΔH = +ve
In the reaction above, an increase in temperature will
A
increase the value of the equilibrium constant
B
decreases the value of the equilibrium constant
C
increase in the reactant production
D
shift the equilibrium to the left
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 #4774)
Chemistry
UTME / JAMB 2011
Atomic Structure and Periodic Table
An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is
A
16
B
15
C
46
D
31
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 #4699)
Chemistry
UTME / JAMB 2011
Stoichiometry & Mole Concept
The molecular lattice of iodine is held together by
A
dative bond
B
metallic bond
C
hydrogen bond
D
van der Waal's forces
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 #4700)
Chemistry
UTME / JAMB 2011
Matter & Separation Techniques
The arrangement of particles in crystal lattices can be studied using
A
X - rays
B
γ - rays
C
α - rays
D
β - rays
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 #4701)
Chemistry
UTME / JAMB 2011
Stoichiometry & Mole Concept
Diagram
Solution
From the diagram above, find the amount of solute deposited when 200 cm\(^3\) of the solution is cooled from 55^\circC to 40^\circC.
Attached Figure / Diagram
A
0.10 mole
B
0.20mole
C
0.01 mole
D
0.02 mole
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
From the diagram,
55^\circC = 7 moles; 40^\circC = 6 moles.
Amount of solute deposited = 7 - 6 = 1 mole.
1000 cm\(^3\) = 1 mole
200 cm\(^3\) = x
x = \(\frac{200 \times 1}{1000}\)
= 0.20 mole.
Source: Myschool Past Questions Archive (Record #4702)
Chemistry
UTME / JAMB 2011
Matter & Separation Techniques
The importance of sodium aluminate (III) in the treatment of water is to
A
cause coagulation
B
neutralize acidity
C
prevent goitre and tooth decay
D
kill germs
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 #4769)
Chemistry
UTME / JAMB 2011
Matter & Separation Techniques
CH3COOH(aq) + OH-(aq) ↔ CH3COO-(aq) + H2O(l)
In the reaction above ,CH3COO-(aq) is
A
conjugate base
B
acid
C
base
D
conjugate acid
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 #4775)
Chemistry
UTME / JAMB 2011
Acids, Bases, and Salts
How many cations will be produced from a solution of potassium aluminium tetraoxosulphate (VI)?
A
3
B
4
C
1
D
2
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 #4776)
Chemistry
UTME / JAMB 2011
Matter & Separation Techniques
Which of the following is NOT an alkali?
A
NH3
B
Mg(OH)2
C
Ca(OH)2
D
NaOH
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 #4777)
Chemistry
UTME / JAMB 2011
Electrochemistry and Redox
Solution
An effect of thermal pollution on water bodies is that the
A
volume of water reduces
B
volume of chemical waste increase
C
level of oxides of nitrogen increase
D
level of oxygen reduces
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Thermal pollution involves the discharge of heated water (often from power plants or industrial processes) into natural water bodies. This temperature increase directly causes a reduction in dissolved oxygen levels because gases are less soluble in warmer liquids.
Source: Myschool Past Questions Archive (Record #4778)
Chemistry
UTME / JAMB 2011
Matter & Separation Techniques
MnO-4(aq) + Y + 5Fe2+(aq) → Mn2+(aq) + 5Fe2+(aq) + 4H2O(l)
In the equation above, Y is
A
5H+(aq)
B
4H+(aq)
C
10H+(aq)
D
8H+(aq)
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 #4785)