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Chemistry
UTME / JAMB 2014
Organic Chemistry
The polymer used in making car rear lights is
A
perspex
B
bakeelite
C
polystyrene
D
polyacrylonitrile
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 #30766)
Chemistry
UTME / JAMB 2014
Acids, Bases, and Salts
Solution
CH3COOC2H5(1) + H2O(1) ⇌ CH 3COOH (aq) + C 2H 5OH (aq)
The purpose of H+ in the reaction above is to
A
increase the yield of products
B
maintain the solution at a constant PH
C
increase the rate of the hydrolysis
D
decrease the rate of the reverse reaction
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The purpose of hydrogen ion is to speed up the decomposition of ethyl ethanoate to yield ethanoic acid and ethanol...so we can say that it is serving as a calalyst i.e increases the rate of hydrolysis.
Source: Myschool Past Questions Archive (Record #30768)
Chemistry
UTME / JAMB 2014
Stoichiometry & Mole Concept
Solution
A hydrocarbon has an empirical formula CH and a vapour density of 39. Determine its molecular formula.
[C = 12, H = 1]
A
C2H6
B
C3H8
C
C3H4
D
C6H6
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
molecular mass = 2 x vapour density
= 2 x 39 = 79
∴ Cn Hn = 78
12n + 1n = 78
13n = 78
n = \(\frac{78}{13}\) = 6
∴ Cn Hn = C 6H 6
Source: Myschool Past Questions Archive (Record #30771)
Chemistry
UTME / JAMB 2014
Matter & Separation Techniques
Solution
Polystyrene is widely used as packaging materials for fragile objects during transportation because of its
A
lightness
B
low density
C
high density
D
high compressibility
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
EPS is known as one of the world’s most effective and lightweight insulation and packaging materials. It has low thermal conductivity and is moisture resistant, so it is often used as insulation against changing temperatures. Its high compressive strength gives it excellent shock absorption properties, making it an efficient packaging material.
Source: Myschool Past Questions Archive (Record #30773)
Chemistry
UTME / JAMB 2014
Kinetics, Energetics and Equilibrium
The process of converting linear alkanes to branched chain and cyclic hydrocarbons by heating in the presence of a catalyst to improve the quality of petrol is referred to as
A
refining
B
cracking
C
reforming
D
blending
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 #30774)
Chemistry
UTME / JAMB 2014
Matter & Separation Techniques
The petroleum fraction that is used in heating furnaces in industries is
A
diesel oil
B
gasoline
C
kerosene
D
lubricating oil
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 #30775)
Chemistry
UTME / JAMB 2014
Stoichiometry & Mole Concept
Diagram
Solution
The IUPAC nomenclature of the compound above is
Attached Figure / Diagram
A
2-bromo-3-chlorobutanol
B
3-bromo-2-chlorobutanol
C
3-chloro-2-bromobutanol
D
2-chloro-3-bromobutanol
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The IUPAC name for CH\(_2\)(OH)CH(Cl)CH(Br)CH\(_3\) is 3-bromo-2-chlorobutanol. The molecule is a four-carbon chain (but-) with a hydroxyl group (alcohol) at position 1, a chlorine atom at position 2, and a bromine atom at position 3, ordered alphabetically.
Longest Chain: Butane (4 carbons).
Functional Group: Alcohol (−OH) takes precedence, starting numbering from the right to give it position 1.
Substituents: 3-bromo, 2-chloro.
Alphabetical Order: Bromo comes before Chloro, hence 3-bromo-2-chlorobutanol.
Source: Myschool Past Questions Archive (Record #31721)
Chemistry
UTME / JAMB 2014
Acids, Bases, and Salts
Diagram
Solution
In the diagram, the function of the concentrated H2SO4 is to?
Attached Figure / Diagram
A
purify the gas
B
dry the gas
C
liquefty the gas
D
remove odour
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Concentrated sulphuric acid is a very effective drying agent.
The chlorine obtained as the product from the above reaction contains traces of water vapour, and hydrogen chloride (HCl) vapours.
HCl vapours are removed by passing the gas through water, and the traces of water vapour are removed by passing through conc.sulphuric acid.
Source: Myschool Past Questions Archive (Record #31723)
Chemistry
UTME / JAMB 2014
Matter & Separation Techniques
Diagram
Z in diagram above represents
Attached Figure / Diagram
A
heat of reaction
B
activation energy
C
free energy
D
entropy of reaction
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 #31725)
Chemistry
UTME / JAMB 2014
Matter & Separation Techniques
Z in diagram above represents
A
heat of reaction
B
activation energy
C
free energy
D
entropy of reaction
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: Official Exam / Past Question Archive
Chemistry
WAEC / WASSCE 2014
Matter & Separation Techniques
The shape of CH4 is
A
linear
B
planar
C
pyramidal
D
tetrahedral
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 #37820)
Chemistry
WAEC / WASSCE 2014
Atomic Structure and Periodic Table
Solution
The crystal layers in graphite are held together by
A
covalent bond
B
electrostatic forces
C
ionic bond
D
van der Waal's forces
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
The atoms in a given layer are held together by strong covalent linkages, but the forces between the layers are the weak van der waals forces
Source: Myschool Past Questions Archive (Record #37821)
Chemistry
WAEC / WASSCE 2014
Atomic Structure and Periodic Table
Hydrogen bonds are formed between molecules containing a hydrogen atom bonded to a
A
strongly electronegative atom
B
non-polar species
C
diatomic element
D
complex ion
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 #37822)
Chemistry
WAEC / WASSCE 2014
Matter & Separation Techniques
The two elements 11X and 19Y are in the same group because they have the same
A
valence electrons
B
ionization energy
C
number of shell
D
atomic size
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 #37823)
Chemistry
WAEC / WASSCE 2014
Matter & Separation Techniques
Which of the following arrangements is in decreasing order of atomic radius?
A
Li>Be>C>
B
Li>B>Be>C
C
Li>Be>B>C
D
C>B>Be>Li
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 #37824)