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Chemistry
UTME / JAMB 1979
Stoichiometry, Mole Concept & Volumetric Analysis
On heating anhydrous iron (ll) sulphate, in addition to producing iron (iii) oxide, which of the following is produced?
A
SO2 (g) + FeS (s)
B
SO3 (g) +FeS(s)
C
SO2 (g) + SO3(g)
D
SO2 (g) + H2S (g)
E
SO3(g) + H2S(g)
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 #27548)
Chemistry
UTME / JAMB 1979
Nature of Matter & Separation Techniques
One of the following techniques can be used to show that chlorophyll pigment is a mixture of chemical compounds and not a single coloured compound
A
cystallization
B
hydrolysis
C
sublimation
D
filtration
E
chromatography
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #27549)
Chemistry
UTME / JAMB 1979
Kinetic Theory of Matter & Gas Laws
Solution
A gas occupies a volume of 30.0 dm\(^3\) at S.T.P. What volume would it occupy at 91\(^0\)C and 380 mm Hg?
A
20. 0dm3
B
40.0dm3
C
60. 0dm3
D
80. 0dm3
E
100. 0dm3
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Given:
V\(_1\) = 30.0 dm\(^3\) , T\(_1\) = 273K , P\(_1\) = 760 mmHg (At S.T. P)
V\(_2\) = ? , T\(_2\) = 91 + 273= 364K , P\(_2\) = 380 mmHg
Using \(\frac{{P_1}{V_1}}{T_1}\) = \(\frac{{P_2}{V_2}}{T_2}\)
V\(_2\) = \(\frac{{P_1}{V_1}{T_2}}{{P_2}{T_1}}\)
= \(\frac{{760}\times{30}\times{364}}{{380}\times{273}}\)
= 80.0 dm\(^3\)
Source: Myschool Past Questions Archive (Record #27550)
Chemistry
UTME / JAMB 1979
Particulate Nature of Matter, Laws & Formulae
the vapour density of a gas may be defined as
A
the mass of a unit volume of the gas compared to an equal volume of water vapour
B
the mass of a unit volume of the gas compared to an equal volume of hydrogen
C
the mass of a unit volume of the gas compared to an equal volume of oxygen
D
the mass of a unit volume of the gas minus the vapour pressure of water
E
two times the relative molecular mass of the gas
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 #27541)
Chemistry
UTME / JAMB 1979
Chemical Energetics & Thermochemistry
The reaction 3C(s) + 2Fe2O3(s) = 4Fe(s) + 3CO2(g): \(\Delta\)H =46.0 kJ is
A
isothermic
B
adiabatic
C
isobaric
D
endothermic
E
exothermic
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 #27542)
Chemistry
UTME / JAMB 1979
Stoichiometry, Mole Concept & Volumetric Analysis
The solution of a sample in a tube will be identified as a chloride if it gives
A
a white precipitate on addition of AgNO3 and barium chloride solutions
B
a white precipiate when acidified with HCI, and then AgNO3 solution added
C
a white precipitate when acidified with dilute HNO3 and then AgNO3 solution added
D
a white precipitate when acidified with dilute H2SO4 and then barium nitrate solution added
E
a pungent smell of chlorine gas when dilute HCI and MnO2 are added
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 #27543)
Chemistry
UTME / JAMB 1979
Organic Chemistry I: Hydrocarbons & Crude Oil
Hydrogenation may be effected by
A
the removal of hydrogen from an alkane in the presence of a catalyst
B
the addition of hydrogen to an alkane in the presence of a catalyst
C
the addition of hydrogen to an alkyne
D
the removal of hydrogen from an alkyne
E
the addition of hydrogen to an ethyl alcohol
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 #27544)
Chemistry
UTME / JAMB 1979
Water, Solutions & Solubility
Two metallic ions associated with hard water are
A
copper and zinc
B
magnesium and silver
C
calcium and magnesium
D
potassium and tin
E
sodium and lead
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 #27545)
Chemistry
UTME / JAMB 1979
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
When excess ethanol is heated to 145 oC in the presence of concentrated sulphuric acid, the product is
A
diethyl ether
B
ethyne
C
diethyl sulphate
D
acetone
E
ethanoic acid
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 #27551)
Chemistry
UTME / JAMB 1979
Metals, Transition Elements & Extraction
Which of the following raw materials would be required from the smelting of iron ore in a blast furnace?
A
CaCO 3
B
Zn(NO3)2
C
CuSO4
D
AICI3
E
CaSO4
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 #27552)
Chemistry
UTME / JAMB 1979
Metals, Transition Elements & Extraction
A piece of metal (M) is dissolved in nitric acid and the resulting solution is treated with a small quantity of sodium hydroxide to produce a white precipitate (B) which redissolves on the addition of excess alkali. The precipitate (B)when ignited in a crucible produces the oxide of the metal(m). The METAL M is
A
Zn
B
Cu
C
Al
D
Au
E
Ca
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 #27553)
Chemistry
UTME / JAMB 1979
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Pick out the correct statement
A
Zinc heated to redness reacts with steam to give oxygen and zinc oxide
B
Zinc heated to redness reacts with steam to give oxygen and hydrogen
C
Zinc does not react with hot or cold water
D
Zinc reacts with hot water to form zinc oxide and hydrogen
E
Zinc reacts very easily with cold water to give zinc oxide and hydrogen
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Zinc metal (Zn) reacts with steam (H\(_2\)O) at high temperatures, resulting in the formation of zinc oxide (ZnO) and the release of hydrogen gas (H\(_2\)).
The chemical equation for this reaction is: Zn(s) + H\(_2\)O(g) → ZnO(s) + H\(_2\)(g)
Source: Myschool Past Questions Archive (Record #27554)
Chemistry
UTME / JAMB 1979
Reaction Rates & Chemical Equilibrium
Solution
Consider the following exothermic reaction \(2SO_{2(g)} + O_{2(g)} = 2SO_{3(g)}\) . If the temperature of the reaction is reduced from 800ºC to 500ºC, and no other change takes place, then
A
the reaction rate increases
B
concentration of SO3 decreases
C
concentration of SO3 increases
D
SO2 gas becomes unreactive
E
O2 gas becomes unreactive
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
reducing the temperature from 800ºc to 500ºc will favour forward reaction according to Le Chatelier's principle hence the concentration of \(SO_3\) increases.
Source: Myschool Past Questions Archive (Record #27555)
Chemistry
UTME / JAMB 1979
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
Solution
The IUPAC name for
Attached Figure / Diagram
A
2-methylbut-3-ene
B
2-methylbut-4-ene
C
3-methylbut-2-ene
D
3-methylbut-1-ene
E
3-methylpent-1-ene
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Counting the number of Carbon atoms from either way, preference must be given to the Carbon with the double bond. From L-R, the methyl group is on C-2 while counting from R-L, it's on C-3, in terms of the smaller number, it should have been 2-methyl...but since the double bond is on C-1 regardless of the position of the substituent, we'll number in reference to the double bond. Hence, the longest Carbon chain is 4, which is but-1-ene. When the substituent group (Methyl) is added to get the full numenclature which is 3-methyl but-1-ene.
Source: Myschool Past Questions Archive (Record #31299)
Chemistry
UTME / JAMB 1979
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Diagram
Solution
Which of the structural formula above is ethanoic acid is
Attached Figure / Diagram
A
A
B
B
C
C
D
D
E
E
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
Ethanoic acid is CH3COOH
Source: Myschool Past Questions Archive (Record #31300)