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Chemistry
UTME / JAMB 2013
Matter & Separation Techniques
2- methylpropan-2-ol is an example of a
A
dihydric alkanol
B
tertiary alkanol
C
secondary alkanol
D
primary alkanol
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 #27458)
Chemistry
UTME / JAMB 2013
Matter & Separation Techniques
The reaction between ammonia and ethyl ethanoate produces
A
propanol and ethanamide
B
propanol and propanamide
C
ethanol and propanamide
D
ethanol and ethanamide
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 #27459)
Chemistry
UTME / JAMB 2013
Acids, Bases, and Salts
The decarboxylation of ethanoic acid will produce carbon (IV)oxide and
A
methane
B
ethane
C
propane
D
butane
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 #27460)
Chemistry
UTME / JAMB 2013
Matter & Separation Techniques
Diagram
From the diagram above, an ideal gas is represented by
Attached Figure / Diagram
A
Z
B
W
C
X
D
Y
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 #31679)
Chemistry
UTME / JAMB 2013
Acids, Bases, and Salts
Diagram
Solution
In the graph above, the activation energy of the catalyzed reaction is
Attached Figure / Diagram
A
100KJ
B
300KJ
C
250KJ
D
200KJ
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
In the graph above, the activation energy of the catalyzed reaction is shown by the curve with the broken lines. Tracing it to the peak of the hump and extrapolating, we have 200kJ. However, to find the activation energy, it is the difference between the energy of the peak of the hump and energy of the reactant.
i.e Activation energy = Energy at the peak of the hump - energy of the reactant
= 200 - 100
= 100kJ
Source: Myschool Past Questions Archive (Record #31680)
Chemistry
UTME / JAMB 2013
Acids, Bases, and Salts
Diagram
Choose the correct option from the graph above . 3Fe(S) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g). The equilibrium constant, K, of the reaction above is represented as
Attached Figure / Diagram
A
A
B
B
C
C
D
D
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 #31691)
Chemistry
UTME / JAMB 2013
Matter & Separation Techniques
Diagram
Solution
The IUPAC nomenclature for the compound above is
Attached Figure / Diagram
A
4-methylpent-1-ene
B
3-methylpent-2-ene
C
2-methylpent-1ene
D
2-methylpent-4-ene
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The IUPAC name of the compound in question is 4-methylpent-1-ene.
Source: Myschool Past Questions Archive (Record #31696)
Chemistry
UTME / JAMB 2013
Acids, Bases, and Salts
Diagram
Use the above option to answer this question. The dehydration of ammonium salt of alkanoic acids produces a compound with the general formula
Attached Figure / Diagram
A
A
B
B
C
C
D
D
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 #31700)
Chemistry
UTME / JAMB 2013
Atomic Structure and Periodic Table
Diagram
Solution
Use the following option above to answer this question. Which of the following compounds in solution will turn red litmus paper blue?
Attached Figure / Diagram
A
A
B
B
C
C
D
D
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
RNH\(_2\), a general representation for an amine, turns red litmus paper blue because amines are basic in nature. When an amine is dissolved in water, it acts as a base, accepting a proton (H+) and forming a conjugate acid and a hydroxide ion (OH-). The presence of hydroxide ions makes the solution alkaline, and alkaline solutions turn red litmus paper blue.
Source: Myschool Past Questions Archive (Record #31703)
Chemistry
UTME / JAMB 2013
Matter & Separation Techniques
Diagram
The compound above is an
Attached Figure / Diagram
A
alkanone
B
alkanoate
C
alkanal
D
akanol
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 #31705)
Chemistry
UTME / JAMB 2013
Matter & Separation Techniques
2SO2(g) + O2(g) \( \iff \)2SO3(g)
\( \bigtriangleup H = -395.7kJmol^{-1} \)
In the reaction above, the concentration of 2SO3(g) can be in creased by
A
decreasing the pressure
B
decreasing the temperature
C
the addition of catalyst
D
increasing the temperature
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: Official Exam / Past Question Archive
Chemistry
WAEC / WASSCE 2013
Matter & Separation Techniques
Solution
The formula of the compound formed between a trivalent metal, M and a divalent non-metal, Y is
A
M2Y3
B
M3Y2
C
MY
D
M3Y
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
M is a trivalent metal i.e M = 3+ ; Y is a divalent non-metal i.e Y = 2-
A reaction between M and Y will yield M\(_2\)Y\(_3\).
Source: Myschool Past Questions Archive (Record #37649)
Chemistry
WAEC / WASSCE 2013
Atomic Structure and Periodic Table
Solution
An atom of an element X gains two electrons. The symbol of the ion formed is
A
X +
B
X 2+
C
X 2-
D
X -
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
X gained two electrons. X = 2-.
The ion formed is X\(^{2-}\).
Source: Myschool Past Questions Archive (Record #37654)
Chemistry
WAEC / WASSCE 2013
Atomic Structure and Periodic Table
Solution
Which of the following statements is correct?
A
Atomic size decreases down the group
B
Atomic size increases across the period
C
Anions are smaller than the parent atom
D
Cations are smaller than the parent atom
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
A cation is a positively charged ion. This means electron is given out by a cation, hence the cation is smaller than the parent atom.
Source: Myschool Past Questions Archive (Record #37655)
Chemistry
WAEC / WASSCE 2013
Atomic Structure and Periodic Table
Solution
Which of the following arrangements represents the correct order of electronic energy level?
A
1s 2p 2s 3p 3s 3d 4s
B
1s 2s 2p 3s 3p 3d 4s
C
1s 2s 2p 3s 3p 4s 3d
D
1s 2s 3s 2p 3p 4s 3d
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
the correct order of electronic energy level is OPTION C according to the Aufbau principle.
Source: Myschool Past Questions Archive (Record #37656)