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Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Which of these gases can be dried with concentrated H2SO4?
A
HBr
B
H2S
C
NH3
D
SO2
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
In the preparation of \(SO_{2}\), we have the resultant reaction from heating the mixture of \(Na_{2}SO_{3}\) and \(HCl\) as:
\(Na_{2}SO_{{3}{(aq)}} + 2HCl_{(aq)} \to 2NaCl_{(aq)} + H_{2}O_{(l)} + SO_{{2}{(g)}}\)
Passing the gas evolved through conc. \(H_{2}SO_{4}\), we collect \(SO_{2}\) by DOWNWARD DELIVERY, leaving \(NaCl\) in the flask.
Source: Myschool Past Questions Archive (Record #13421)
Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Which of these salts will produce its metal, oxygen and nitrogen (IV) oxide on heating?
A
Silver and trioxonitrate (V)
B
Sodium trioxonitrate (V)
C
Calcium trioxonitrate (V)
D
Lithium 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 #13422)
Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
An experiment produces a gaseous mixtures of carbon (IV) oxide and carbon (II) oxide. In order to obtain pure carbon (II) oxide, the gas mixture should be?
A
passed over heated copper (II) oxide
B
bubbled through concentrated tetraoxosulphate (IV) acid
C
bubbled through sodium hydroxide solution
D
bubbled through water
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 #13425)
Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following is a property of ionic chlorides?
A
They can be decomposed by heat
B
They react with aqueous AgNO3 to give a white precipiate which is soluble in excess ammonia
C
They explode when in contact with dry ammonia
D
They react with concentrated tetraoxosulphate (IV) acid to give white fumes of chlorine 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 #13432)
Chemistry
UTME / JAMB 1993
Stoichiometry, Mole Concept & Volumetric Analysis
When dilute aqueous solutions of lead (II) nitrate and potassium bromide are mixed, a precipitate is observed.
The products of this reaction are?
A
PbO(s) + Br- + KNO3
B
Br2 + NO2(g) + PbBr2(s)
C
PbO(s) + K+(aq) + Br(aq) + NO2(g)
D
PbBr2(s) + K(aq) + K+(aq) + NO3(aq)
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 #13437)
Chemistry
UTME / JAMB 1993
Metals, Transition Elements & Extraction
Solution
Bronze is an alloy of?
A
silver and copper
B
silver and gold
C
copper and nickle
D
copper and zinc
E
copper and tin
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
Bronze is an alloy of copper and tin.
Source: Myschool Past Questions Archive (Record #13445)
Chemistry
UTME / JAMB 1993
Oxidation, Reduction & Redox Reactions
The active reducing agent in the blast furnace for the extraction of iron is?
A
carbon
B
limestone
C
carbon(II)oxide
D
calcium oxide
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 #13448)
Chemistry
UTME / JAMB 1993
Organic Chemistry I: Hydrocarbons & Crude Oil
The fraction of crude oil used as jet fuel is?
A
refinery gas
B
diesel oil
C
kerosene
D
gasoline
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 #13452)
Chemistry
UTME / JAMB 1993
Organic Chemistry I: Hydrocarbons & Crude Oil
It is not desirable to use lead tetraethyl as an anti-knock agent because?
A
it is expensive
B
of pollution effects from the exhaust fumes
C
it lowers the octane rating of petrol
D
it is explosive
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 #13454)
Chemistry
UTME / JAMB 1993
Acids, Bases, pH & Salts
Al2O3(s) + 3H2SO4(aq) → Al2(SO4(aq)) + 3H2(I)O
Al2O3(s) + 2NaOH(aq)) + 3H2(I)O → 2NaAl(OH)4(aq)).
We can conclude from the equations above that Al2O3(s) is?
A
an acidic oxide
B
an amphoteric oxide
C
a basic oxide
D
a neutral oxide
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 #13456)
Chemistry
UTME / JAMB 1993
Chemical Bonding & Intermolecular Forces
The carbon atoms on ethane are?
A
sp2 hybridized
B
sp3 hybridized
C
sp2d hybridized
D
sp hybridized
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 #13457)
Chemistry
UTME / JAMB 1993
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Palm wine turns sour with time because?
A
the sugar content is converted into alcohol
B
the carbon (IV) oxide formed during the fermentation process has a sour taste
C
it is commonly adulterated by the tappers and sellers
D
microbial activity results in the production of orgain acids within it
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 #13458)
Chemistry
UTME / JAMB 1993
Organic Chemistry I: Hydrocarbons & Crude Oil
Catalytic hydrogenation of benzene produces?
A
an aromatic hydrocarbon
B
margarine
C
cyclohexane
D
D.D.T
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 #13459)
Chemistry
UTME / JAMB 1993
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which of the following represents saponification?
A
Reaction of carboxylic acids with sodium hydroxide
B
Reaction of alkanoates with acid
C
Reaction of alkanoates with alcohols
D
Reaction of alkanoates with sodium hydroxide
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 #13461)
Chemistry
UTME / JAMB 1993
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The confirmatory test for alkanoic acids in organic qualitative analysis is the?
A
turning of wet blue litmus paper red
B
reaction with alkanols to form esters
C
reaction with sodium hydroxide to form salt and water
D
reaction with aqueous Na2COsp3 to liberate a gas which turns lime water milky
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 #13469)