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Chemistry
UTME / JAMB 1987
Electrolysis & Electrochemical Cells
Corrosion is exhibited by?
A
iron only
B
electropostive metals
C
metals below hydrogen inthe electrochemical series
D
all metals
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 #14545)
Chemistry
UTME / JAMB 1987
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
Inspite of the electronic configuration, 1s22s22p2, carbon is tetraavalent because?
A
the electrons in both 2s and 2p orbitals have equal energy
B
the electrons in both 2s and 2p orbitals are equivalent
C
both the 2s and 2p orbitals hybridizes
D
the six orbitals hybridize to four
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
both the 2s and 2p orbitals hydrodizes
Source: Myschool Past Questions Archive (Record #14547)
Chemistry
UTME / JAMB 1987
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?
A
CH3 = CHCH3
B
CH3 ≡ CCH3
C
HC = C-CH2CH3
D
CH2 = CH-CH = CH2
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
HC = C-CH2CH3
Source: Myschool Past Questions Archive (Record #14551)
Chemistry
UTME / JAMB 1987
Organic Chemistry I: Hydrocarbons & Crude Oil
The efficiency of petrol as a fuel in high-compression internal combustion engines improves with an increase in the amount of?
A
branched chain alkanes
B
straight chain alkanes
C
cycloalkanes
D
halogenated hydrocarbons
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 #14553)
Chemistry
UTME / JAMB 1987
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?
A
trichloromethane
B
triodomethane
C
iodoethane
D
ethanal
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The reaction between ethanol and aqueous sodium mono-oxoiodate (I) (also known as sodium hypoiodite,) is a classic chemical test called the iodoform test. Sodium oxoiodate (I) acts as both an oxidizing and halogenating agent.
Ethanol is first oxidized to ethanal.
The ethanal further reacts with the iodine species to form triiodomethane (CH\(_3\)I), commonly known as iodoform.
Triiodomethane is a bright yellow crystalline solid with a distinct, medicinal, or "characteristic" smell, which serves as a positive identification for alcohols containing the CH\(_3\)CH(OH) - group.
Source: Myschool Past Questions Archive (Record #14558)
Chemistry
UTME / JAMB 1987
Organic Chemistry I: Hydrocarbons & Crude Oil
The most volatile fraction obtained from fractional distillation of crude petroleum contains?
A
butane , propane and kerosene
B
butane , propane and petrol
C
ethane, methane and benzene
D
methane, ethane and propane
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 #14561)
Chemistry
UTME / JAMB 1987
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the?
A
acid
B
ester of allanoic acid
C
alkali
D
alkanol
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 #14562)
Chemistry
UTME / JAMB 1987
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
Synthetic rubber is made by polymerization of
A
2 methyl buta - 1, 3 - diene
B
2 methyl buta - 1, 2 - diene
C
2 methyl but -1-ene
D
2 methyl but-2-ene
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Synthetic rubber can be produced by the polymerization of several monomers, but 2-methylbuta-1,3-diene (commonly known as isoprene) is the monomer used to create polyisoprene, a synthetic rubber that is chemically identical to natural rubber. While other synthetic rubbers exist, such as neoprene (made from 2-chloro-1,3-butadiene) and SBR (made from styrene and 1,3-butadiene), 2-methylbuta-1,3-diene is the specific diene listed in your options that serves as a fundamental building block for rubber synthesis.
Source: Myschool Past Questions Archive (Record #14563)
Chemistry
UTME / JAMB 1987
Stoichiometry, Mole Concept & Volumetric Analysis
Complete oxidation of propan -1- ol gives?
A
propanal
B
propan-2-al
C
propan-1-one
D
propanoic acid
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 #14564)
Chemistry
UTME / JAMB 1987
Organic Chemistry I: Hydrocarbons & Crude Oil
When water drops are added to calcium carbide in a container and the gas is passed through a jet and lifted, the resultant flame is called an?
A
oxyethylene flame
B
oxyhydrocarbon flame
C
oxyacetylene flame
D
oxymethane flame
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 #14565)
Chemistry
UTME / JAMB 1987
Periodic Table & Periodicity
Solution
A stream of air was successively passed through three tubes X, Y and Z containing a concentrated aqueous solution of KOH, red hot copper powder and fused calcium chloride respectively. What was the composition of the gas emanating from tube Z?
A
CO2 ad ithe inert gases
B
N2, CO2 and the inert gases
C
N2 and the inert gases
D
water vapour, N2 and the inert gases
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
When a stream of air is passed through a tube containing fused Calcium chloride, the calcium chloride absorbs moisture (water vapour) from the air because it is deliquiscent. Thus, the gas emanating from the tube will be dry air(Nitrogen and inert gas) with a significant reduced or negligible amount of water vapour.
Source: Myschool Past Questions Archive (Record #14585)
Chemistry
UTME / JAMB 1987
Acids, Bases, pH & Salts
In the purification of town water supply, alum is used principally to?
A
kill bacteria
B
control the pH of water
C
improve the taste of the water
D
coagulate small pasrticles of mud
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 #14586)
Chemistry
UTME / JAMB 1987
Water, Solutions & Solubility
Which of the following water samples will have the highest titre value when titrated for the Ca2+ ions using soap solution?
A
Permanently hard water after boiling
B
emporarily hard water after boiling
C
Rain water stored in a glass jar for two years
D
Permanent hard water passed through permuitit
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 #14588)
Chemistry
UTME / JAMB 1987
Air & Environmental Chemistry
Oil spillage in ponds and creeks can be cleaned up by?
A
burning off the oil layer
B
spraying with detergent
C
dispersal with compressed air
D
spraying with hot water
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 #14590)
Chemistry
UTME / JAMB 1987
Water, Solutions & Solubility
Solution
The solubility of Na3AsO4(H2O)12 is 38.9g per 100g H2O. What is the mass percentage of Na3AsO4 in the saturated solution?
(As = 75, Na = 23, O = 16, H = 1)
A
87.27%
B
38.9%
C
19.1%
D
13.7%
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Given:
Mass of hydrated salt (Na\(_3\)AsO\(_4\)(H\(_2\)O)\(_{12}\)) = 38.9g
Mass of hydrated salt (Na\(_3\)AsO\(_4\)) = X
Molar mass of hydrated salt (Na\(_3\)AsO\(_4\)(H\(_2\)O)\(_{12}\)) = (23 x 3) + 75 + (16 x 4) + (18 x 12) = 424g/mol
Molar mass of hydrated salt (Na\(_3\)AsO\(_4\)) = (23 x 3) + 75 + (16 x 4) = 208g/mol
Using the formula,
\(\frac{mass of hydrated salt}{mass of anhydrous salt}\) = \(\frac{Molar mass of hydrated salt}{Molar mass of anhydrous salt}\)
\(\frac{38.9}{X}\) = \(\frac{424}{208}\)
X = 19.083 = 19.1%
The mass of anhydrous salt is obtained to be 19.1%
However, we need to get the total mass of the solution, and this we can get by first solving for the total mass of water that make up the solution.
Mass of water in hydrated salt = mass of hydrated salt - mass of anhydrous salt
= 38.9 - 19.1 = 19.8g
Also, recall that 38.9g salt was dissolved in 100g of water ⇒ total mass of water = 100 + 19.8 = 119.8g
Total mass of solution = mass of Na\(_3\)AsO\(_4\) + mass of H\(_2\)O
= 19.1 + 119.8 = 138.9g
Therefore, %Mass of Na\(_3\)AsO\(_4\) in the saturation solution = \(\frac{mass of anhydrous salt}{Total mass of solution}\times 100\)
= \(\frac{19.1}{138.9}\times 100\)
= 13.75%
Source: Myschool Past Questions Archive (Record #14593)