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Chemistry
UTME / JAMB 2015
Acids, Bases, and Salts
Solution
Which of the following types of alkanols undergo oxidation to produce alkanoic acids.
I. Primary alkanols
II. Secondary alkanols
III. Tertiary alkanols
A
I, II and III
B
I and II only
C
III only
D
I only
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Only primary alkanols undergo oxidation to produce alkanoic acid. Option A,B,C will not produce alkanoic acid
Source: Myschool Past Questions Archive (Record #40934)
Chemistry
UTME / JAMB 2015
Atomic Structure and Periodic Table
Solution
Rare gases are stable because they
A
are monoatomic
B
form ions easily
C
have duplet or octet electronic configuration in the outermost shells in their atoms
D
are volatile gases
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Rare gases are stable because they have duplet or octet electronic configurations in the outermost shells in their atoms, as a result they don’t go into solution easily. option A, B, Dare not because they go into solution easily (unstable)
Source: Myschool Past Questions Archive (Record #40938)
Chemistry
UTME / JAMB 2015
Matter & Separation Techniques
A major source of oxide of nitrogen is from the burning of
A
coal
B
wood
C
fuel
D
chlorofluorocarbons
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 #40939)
Chemistry
UTME / JAMB 2015
Matter & Separation Techniques
Solution
Which of these radioactive elements is commonly used as a nuclear fuel
A
uranium
B
palladium
C
actium
D
thorium
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Uranium is common nuclear because of its less stability as a result has a great tendency to increase energy than. Options B,C,D which are not stable
Source: Myschool Past Questions Archive (Record #40942)
Chemistry
UTME / JAMB 2015
Stoichiometry & Mole Concept
Solution
All these are electromagnetic waves except
A
White light
B
Photon
C
X-ray
D
Infrared
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Photon is unit of energy that carries light and has zero mass A, C and D are all electromagnetic waves of higher mass
Source: Myschool Past Questions Archive (Record #40947)
Chemistry
UTME / JAMB 2015
Stoichiometry & Mole Concept
Solution
A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, Find the molecular formula [H = 1, C = 12, O = 16)
A
CH2O
B
C3H6O3
C
C6H12O6
D
C6H12O3
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
C = 40%, 40/12 = 3.33
H = 6.7%, 6.7/1 = 6.7
O = 53.3%, 53.3/16 = 3.33
C = 3.33/3.33 = 1
H = 6.7/3.33 = 2
O = 3.33/3.33 = 1
(CH2O)n = 180
(12 + 2 + 16)n = 180
30n = 180
n = 6
= C6H12O6
Source: Myschool Past Questions Archive (Record #40965)
Chemistry
UTME / JAMB 2015
Electrochemistry and Redox
Solution
An oxidation state of Cr in K2Cr2O7
A
7
B
6
C
5
D
4
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The oxidation state of K2Cr2O7 is +6. option A,C,D are the oxidation state of other elements like O7,C14, etc.
\(+2 + 2x + (-2\times7) =0\)
\(2x=12\)
\(x = +6\)
Source: Myschool Past Questions Archive (Record #40969)
Chemistry
UTME / JAMB 2015
Atomic Structure and Periodic Table
Solution
The elements that belong to the third period of periodic table are
A
Li, Be, Al and D
B
Na, P, O and Cl
C
B, C, N, and O
D
Na, Mg, S and Ar
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Na, Mg, S and Ar is the set of elements that belong to third period of the periodic table. Option A,B,C have elements which belong to the other period in the periodic table included in them.
Source: Myschool Past Questions Archive (Record #40971)
Chemistry
UTME / JAMB 2015
Matter & Separation Techniques
Solution
NH3(g) + HCl(s) → NH 4Cl (s)
The entropy change in the system above is
A
positive
B
zero
C
negative
D
intermediate
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Entropy s is a measure of the degree of disorder or randomness of a substance. The entropy charge in the system is negative. Options B, C, D will not give negative but the result into positive
Source: Myschool Past Questions Archive (Record #40975)
Chemistry
UTME / JAMB 2015
Acids, Bases, and Salts
Solution
\(Cu_2S_{(s)}+ O_{2(g)} = 2CU_{(s)} + SO_{2(g)}\).
In the above reaction, the oxidation number of Cu changes from ___ to _______?
A
+1 to 0
B
0 to +2
C
+2 to +1
D
0 to +1
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The oxidation number is from +1 to O as a result of the release of sulphur. Options B, C, and D are not the actual oxidation number for copper
Source: Myschool Past Questions Archive (Record #40950)
Chemistry
UTME / JAMB 2015
Organic Chemistry
Solution
The number of isomers formed by C6H14 is
A
4
B
5
C
2
D
3
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The number of isomers C6H14 cm is 5. it will not form options A,C, D
Source: Myschool Past Questions Archive (Record #40952)
Chemistry
UTME / JAMB 2015
Stoichiometry & Mole Concept
Solution
The basic particles from which matter could be made up of are as follow, except?
A
Salt
B
Atom
C
Ion
D
Molecule
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Salt is a chemical used for varieties of purposes, so it’s not part of matter, Atom being the smallest part of molecule and ion are charge which are part of matter
Source: Myschool Past Questions Archive (Record #40954)
Chemistry
UTME / JAMB 2015
Matter & Separation Techniques
Solution
The energy value of petrol can be determined by
A
Bomb calorimeter
B
Catalytic cracker
C
Fractionating column
D
Thermometer
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
A bomb calorimeter is the device primarily used to determine the energy value (or calorific value) of petrol (or gasoline) by measuring the heat released during its combustion.
Source: Myschool Past Questions Archive (Record #40956)
Chemistry
UTME / JAMB 2015
Acids, Bases, and Salts
Solution
What volume of 0.5mldm3 H2SO4 will exactly neutralize 20cm3 of 0.1moldm3 NaOH Solution?
A
2.0cm3
B
5.0cm3
C
6.8cm3
D
8.3cm3
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
2NaOH + H2SO4 → Na2SO4 + 2H2O
CaVa) ÷ (CbVb) = ratio of acid / ratio of base
0.5Va ÷ (0.1 × 20) = ½
Va = 2.0cm3
Source: Myschool Past Questions Archive (Record #40960)
Chemistry
UTME / JAMB 2015
Organic Chemistry
Solution
Detergents are manufactured with straight hydrocarbon chains, is to make them
A
soluble
B
biodegradable
C
cheaper
D
foamy
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Biodegradable because the straight hydrocarbons are natural and slightly soluble in water. Options A,C,D do not have strength hydrocarbon chains and they could harm the environment if they are made with the detergent
Source: Myschool Past Questions Archive (Record #40976)