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Chemistry
UTME / JAMB 1984
Chemical Bonding & Intermolecular Forces
The hybridization of the carbon atom in ethyne is
A
sp 4
B
sp 3
C
sp2
D
sp
E
s
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 #27642)
Chemistry
UTME / JAMB 1984
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
An organic compound with a vapour density 56.5 has the following percentage composition:C =53.1% N = 12.4%, O = 28.3%, H = 6.2%. The molecular formula of the compound is
Relative atomic masses: N = 14, O = 16, C = 12, H = 1 )
A
C3H6O2N
B
C5H6O2N
C
(C5H7O2N)1/2
D
C5H7O2N
E
(C5H7O2N)2
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Elements : C N O H
% By mass 53.1 12.4 28.3 6.2
Divide through by atomic mass \(\frac{53.1}{12}\) \(\frac{12.4}{14}\) \(\frac{28.3}{16}\) \(\frac{6.2}{1}\)
4.425 0.8857 1.7688 6.2
Divide through by the least amount \(\frac{4.425}{0.8857}\) \(\frac{0.8857}{0.8857}\) \(\frac{1.7688}{0.8857}\) \(\frac{6.2}{0.8857}\)
5 : 1 : 2 : 7
Empirical formula : C\(_5\)N\(_1\)O\(_2\)H\(_7\) ⇒ C\(_5\)H\(_7\)NO\(_2\)
Recall that (Empirical formula)n = Relative molecular mass
But Relative molecular mass = 2 x Vapour density
So, (Empirical formula)n = 2 x Vapour density
[C\(_5\)H\(_7\)NO\(_2\) ] n = 2 x 56.5
[ (12 x 5) + (1 x 7) + 14 + (16 x 2) ] n = 113
[60 + 7 + 14 + 32] n = 113
113n = 113
n = \(\frac{113}{113}\) = 1
[C\(_5\)H\(_7\)NO\(_2\) ] n = [C\(_5\)H\(_7\)NO\(_2\) ] 1 ⇒ C\(_5\)H\(_7\)NO\(_2\) - Option D
Source: Myschool Past Questions Archive (Record #27644)
Chemistry
UTME / JAMB 1984
Organic Chemistry I: Hydrocarbons & Crude Oil
When the kerosene fraction from petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as
A
polymerization
B
refining
C
hydrogenation
D
cracking
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 #27645)
Chemistry
UTME / JAMB 1984
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Alkaline hydrolysis of naturally occurring fats and oils yields
A
fats and acids
B
soaps and glycerol
C
margarine and butter
D
esters
E
detergents
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 #27647)
Chemistry
UTME / JAMB 1984
Organic Chemistry I: Hydrocarbons & Crude Oil
Which of the following statements is INCORRECT?
A
Fractional distillation of crude petroleum will give the folloing hydrocarbon fuels in order of increasing boiling point
B
Butane < petrol < kerosene of polythene.
C
Both but-1-ene and but-1-yne will decolorize bromine readily
D
but-2-ene will react with chlorine to form 2,3-dichlorobutane
E
calcuim carbide will react with water to form any alkyne
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 #27648)
Chemistry
UTME / JAMB 1984
Acids, Bases, pH & Salts
Which of the following statements is NOT correct about all four of the acids: HBr, HNO3, H 2CO3 and H2SO4? They
A
dissolve marble to liberate CO
B
have a PH less than 7
C
Turn blue litmus red
D
neutralize alkalis to form salt
E
react with magnesium to liberate hydrogen
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 #27650)
Chemistry
UTME / JAMB 1984
Electrolysis & Electrochemical Cells
Solution
If the cost of electricity required to deposit 1 g of magnesium is N5.00, how much would it cost to deposit 10g of aluminium?
A
N 10.00
B
N27.00
C
N44.44
D
N66.67
E
N33.33
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Mg\(^{2+}\) + 2e\(^-\) → Mg
If 2F produces 24g Mg
then x will produce 1g Mg
24x = 2F
x = \(\frac{2F}{24}\)
Similarly, Al\(^{3+}\) + 3e\(^-\) → Al
If 3F produces 27g Al
then x will produce 10g Al
27x = 3F
x = \(\frac{{3F}\times{10}}{27}\)
x = \(\frac{30F}{27}\)
Now, if \(\frac{2F}{24}\) of Mg costs N5
then \(\frac{30F}{27}\) of Al will cost y
By cross- multiplying to make y the subject of formula.
\(\frac{30F}{27}\times 5\) = \(\frac{2F}{24}\times y\)
y = \(\frac{30F}{27}\times 5\) \div \(\frac{2F}{24}\)
y = \(\frac{30F}{27}\times 5\) x \(\frac{24}{2F}\)
y = \(\frac{{30F}\times{24}\times{5}}{{27}{2F}}\)
y = N 66.67
Therefore, it will cost N66.67 to deposit 10g of Aluminium.
Source: Myschool Past Questions Archive (Record #27652)
Chemistry
UTME / JAMB 1984
Stoichiometry, Mole Concept & Volumetric Analysis
Nitrogen can best be obtained from a mixture over oxygen and nitrogen by passing the mixture over
A
potassium hydroxide
B
heated gold
C
heated magnesium
D
heated phosphorus
E
calcium chloride
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 #27654)
Chemistry
UTME / JAMB 1984
Water, Solutions & Solubility
Water is said to be 'hard' if it
A
easily forms ice
B
has to be warmed before sodium chloride dissolves in it
C
froms an insoluble scum with soap
D
contains nitrates
E
contains sodium ions
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 #27656)
Chemistry
UTME / JAMB 1984
Water, Solutions & Solubility
Sodium hydroxide (NaOH) pellets are
A
deliquescent
B
hygroscopic
C
efflorescent
D
hydrated
E
fluorescent
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 #27657)
Chemistry
UTME / JAMB 1984
Organic Chemistry I: Hydrocarbons & Crude Oil
Alkanes
A
are all gases
B
have the general formula CnH2n + 2O
C
contain only carbon and hydrogen
D
are usually soluble in water
E
are usually active compounds
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 #27659)
Chemistry
UTME / JAMB 1984
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
If an excess of a liquid hydrocarbon is poured into a jar of chlorine, and the sealed jar is then exposed for several hours to bring sunlight, all the chlorine gas is consumed. The hydrocarbon is said to have undergone
A
a polymerization reaction
B
an isomerization reaction
C
an addition reaction
D
a substitution reaction
E
a reduction reaction
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
When a hydrocarbon reacts with chlorine in the presence of sunlight (UV light), it typically undergoes a free-radical substitution reaction. In this process, the energy from the sunlight breaks the chlorine molecules into reactive radicals, which then replace (substitute) hydrogen atoms in the hydrocarbon chain with chlorine atoms. This is characteristic of alkanes (saturated hydrocarbons), which are often liquid at room temperature for higher carbon counts.
Source: Myschool Past Questions Archive (Record #27668)
Chemistry
UTME / JAMB 1984
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The function of conc. H2SO4 in the esterification of ethanoic acid with ethanol is to
A
serve as a dehydrating agent
B
serve as a solvent
C
act as a catalyst
D
prevent any side reaction
E
serve as an oxidizing agent
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 #27669)
Chemistry
UTME / JAMB 1984
Non-Metals & Their Compounds
A piece of sea shell, when dropped into a dilute solution of hydrochloric acid, produces a colourless, odourless gas which turns clear limewater milky. The sea shell contains
A
sodium chloride
B
ammonium nitrate
C
calcium carbonate
D
calcium chloride
E
magnesium chloride
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 #27670)
Chemistry
UTME / JAMB 1984
Electrolysis & Electrochemical Cells
Which of the following electrodes is used in electrolysis of bauxite (Al2O3) in molten cryolite?
A
Steel electrodes
B
Carbon electrodes
C
Mercury electrodes
D
Carbon anode and steel cathode
E
Carbon cathode and stell anode
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 #27671)