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Chemistry
UTME / JAMB 1997
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Oxidation of concentrated hydrochloric acid with manganese (IV) oxide liberates a gas used in the?
A
manufacture of tooth pastes
B
treatment of simple golitre
C
vulcanization of rubber
D
sterilization of water
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 #13831)
Chemistry
UTME / JAMB 1997
Reaction Rates & Chemical Equilibrium
mE + nF → pG + qH. In the equation above, the equilibrium constant is given by?
A
(E)m(F)n/ (G)n(H)q
B
(E)(F) / (G)(H)
C
(G)p(H)q / (E)m(F)n
D
(G)(H) / (E)(F)
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 #13832)
Chemistry
UTME / JAMB 1997
Stoichiometry, Mole Concept & Volumetric Analysis
A compound that will NOT produce oxygen on heating is?
A
potasium dioxonitrate (III)
B
lead (IV) oxide
C
potassium trioxochlorate (V)
D
potassium trioxonitrate (V)
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 #13833)
Chemistry
UTME / JAMB 1997
Non-Metals & Their Compounds
Coal gas is made up of carbon (II) oxide, hydrogen and?
A
nitrogen
B
air
C
argon
D
methane
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 #13834)
Chemistry
UTME / JAMB 1997
Oxidation, Reduction & Redox Reactions
2X(aq) + MnO2(s) + 4H+(aq) → X2(g) + Mn2+(aq) + 2H2O.
The reaction above can be used for the laboratory preparation of all halogens except fluorine because it is?
A
a poisionous gas
B
an oxidizing agent
C
electronegative in nature
D
highly reactive
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 #13835)
Chemistry
UTME / JAMB 1997
Metals, Transition Elements & Extraction
Solution
The removal of rust from iron by treatment with tetraoxosulphate (IV) acid is based on the?
A
hydrolysis of the iron
B
reaction of acid with base
C
oxidationof the rust
D
dehydration of the iron
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The correct answer is option C - Oxidation of the rust.
Although rust (iron(III) oxide) is a base and can react with sulfuric acid, the primary reason sulfuric acid is effective in removing rust is that it oxidizes the rust, breaking it down into soluble iron(III) sulfate.
However, it's worth noting that option B, "Reaction of acid with base", is also a correct description of the reaction. But the question asks for the type of reaction that makes the removal of rust possible, and oxidation is the key process in this case.
Source: Myschool Past Questions Archive (Record #13836)
Chemistry
UTME / JAMB 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the additives could improve the quality of steel?
A
Silicon
B
Sulphur and phosphorus
C
Carbon
D
Chromium and nickel
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 #13837)
Chemistry
UTME / JAMB 1997
Electrolysis & Electrochemical Cells
Sodium hydroxide is prepared commercially from sodium chloride solution by?
A
electrolysis using mercury as cathode
B
hydrolysis in steam using a catalyst
C
electrolysis using iron as anode
D
treating sodium chloride with ammonia and carbon (IV) oxide
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 #13838)
Chemistry
UTME / JAMB 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
A sample of a substance containing only C and H burns in excess O2 to yield 4.4g of CO2
and 2.7 g of H2O. The empirical formula of a substance is?
(C = 12, O = 16, H = 1)
A
CH3
B
CH2
C
CH4
D
C2H24
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
CxHy + (x + y/4)O2 = XCO2 + (y/2)H2O
4.4 2.7
according to the equation 44x = 9y
Carbon Hydrogen
mole given ratio = (44)/(44), (2.7)/(9) = 0.1,0.3
Empirical formula = (0.1)/(0.1), (0.3)/(o.1) = 1,3 ; CH3
Source: Myschool Past Questions Archive (Record #13844)
Chemistry
UTME / JAMB 1997
Organic Chemistry I: Hydrocarbons & Crude Oil
An undesirable paraffin in the petroleum industry which is particularly prone to knocking is?
A
iso-octane
B
n-heptane
C
iso-heptane
D
n-octane
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 #13845)
Chemistry
UTME / JAMB 1997
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The reaction of an alkanol with an alkanoic acid in the presence of concentrated H2SO4 will produce an?
A
alkanal
B
alkanoate
C
alkanone
D
alkyne
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 #13846)
Chemistry
UTME / JAMB 1997
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
The final product of the reaction of ethyne with hydrogen iodide is?
A
CH3—CHI2
B
CH2l—CH2I
C
CH3—CI3
D
CH2 = CHI
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Unsaturated compounds like ethyne readily undergo addition reactions where a molecule adds across the double or triple bond.
Ethyne reacts with HI in a two-step process, with the first step forming an intermediate with a carbon-carbon double bond, and the second step forming the final product, 1,1-diiodoethane.
First step : H-C≡C-H + HI → H\(_2\)C=CHI
Second step: H\(_2\)C=CHI + HI → H\(_3\)C-CHI\(_2\)
Source: Myschool Past Questions Archive (Record #13847)
Chemistry
UTME / JAMB 1997
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
Synthetic rubber obtained by the polymerization of chlorobutadiene in the presence of sodium is called?
A
teflon
B
isoprene
C
polythene
D
neoprene
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Synthetic rubber produced by the polymerization of chlorobutadiene (specifically 2-chloro-1,3-butadiene, also known as chloroprene) is called neoprene. This polymer, also known as polychloroprene, is valued for its chemical stability and flexibility across a wide temperature range. While modern commercial production often uses emulsion polymerization, historical and theoretical contexts (like those found in certain chemistry examinations) link this specific monomer to the formation of neoprene.
Source: Myschool Past Questions Archive (Record #13848)
Chemistry
UTME / JAMB 1997
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
The synthetic detergents are preferred to soap for laundry using hard water because?
A
detergents are water soluble while soap is not
B
the calcium salts of detergents are water soluble
C
the magnesium salt of soap is soluble in hard water
D
soap does not have a hydrocarbon terminal chain
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Synthetic detergents are preferred over soap for laundry in hard water because they don't form insoluble precipitates (scum) like soap does, remaining effective in the presence of calcium and magnesium ions. Hard water contains high levels of dissolved minerals, primarily calcium and magnesium ions. When soap (which is a sodium or potassium salt of a fatty acid) reacts with these ions in hard water, it forms insoluble precipitates, which appear as a scum or curd on clothes and in the washbasin. This scum reduces the cleaning power of the soap and can leave a residue on clothes.
Source: Myschool Past Questions Archive (Record #13851)
Chemistry
UTME / JAMB 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
25 cm\(^3\) of 0.02 M KOH neutralized 0.03 g of a monobasic organic acid having the general formula C\(_n\)H\(_{2n + 1}\)COOH. The molecular formula of the acid is?
(C = 12, H = 1, O = 16)
A
HCOOH
B
C2H5COOH
C
CH3COOH
D
C3H7COOH
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Concentration of KOH = 39 x 0.02 = 0.78 g/dm\(^3\)
25cm\(^3\) required 0.03 g of C\(_n\)H\(_{2n + 1}\)COOH
1000cm\(^3\) will require X
\(\frac{{1000}\times{0.03}}{25}\) = 1.2g
C\(_n\)H\(_{2n + 1}\)COOH + KOH → C\(_n\)H\(_{2n + 1}\)COOK + H\(_2\)O
Recall that \(\frac{M_A V_A}{M_B V_B}\) = \(\frac{1}{1}\)
\(\frac{{M_A}\times{1.2}}{{0.02}\times{0.78}}\) = \(\frac{1}{1}\)
M\(_A\) = 0.013
Con. = Molarity x Molecular Mass
Molecular Mass = (0.78) / (0.013) x 60
C\(_n\)H\(_{2n + 1}\)COOH = 60
12n + 1 (2n + 1) + 12 + 32 + 1 = 60
14n = 60 - 46
n =\(\frac{14}{14}\) = 1
Substituting n = 1 into C\(_n\)H\(_{2n + 1}\)COOH
We'll have CH\(_3\)COOH
∴ CH\(_3\)COOH
Source: Myschool Past Questions Archive (Record #13855)