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Chemistry
UTME / JAMB 2014
Stoichiometry, Mole Concept & Volumetric Analysis
The general formula of haloalkanes where X represents the halide is
A
Cn H 2n-1X.
B
C nH 2nX.
C
C nH 2n+2 X
D
C nH 2n+1X
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 #30735)
Chemistry
UTME / JAMB 2014
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The alkanol obtained from the production of soap is
A
propanol
B
ethanol
C
glycerol
D
methanol
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 #30736)
Chemistry
UTME / JAMB 2014
Organic Chemistry I: Hydrocarbons & Crude Oil
Ethyne is passed through a hot tube containing organo-nickel catalyst to produce
A
isoprene
B
polythene
C
ethanol
D
benzene
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 #30746)
Chemistry
UTME / JAMB 2014
Organic Chemistry I: Hydrocarbons & Crude Oil
Due to the unstable nature of ethyne, it is stored by dissolving in
A
ethane-1,2-diol
B
propanol
C
ethanoic acid
D
propanone
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 #30764)
Chemistry
UTME / JAMB 2014
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The process of converting starch to ethanol is
A
cracking
B
distillation
C
fermentation
D
oxidation
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 #30765)
Chemistry
UTME / JAMB 2014
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
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
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
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 & Volumetric Analysis
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
Stoichiometry, Mole Concept & Volumetric Analysis
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
Organic Chemistry I: Hydrocarbons & Crude Oil
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
Organic Chemistry I: Hydrocarbons & Crude Oil
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
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
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
Water, Solutions & Solubility
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
Chemical Energetics & Thermochemistry
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
Chemical Energetics & Thermochemistry
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