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Chemistry
UTME / JAMB 1991
Nature of Matter & Separation Techniques
A certain liquid has a high boiling point. It is viscous, non-toxic, miscible with water being very hygroscopic. This liquid is most likely to be?
A
CH3CH2CH2HO
B
CH3CHOHCH3
C
CH3CH2CHOHCH3
D
CH2OHCHOHCH2OH
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 #13106)
Chemistry
UTME / JAMB 1991
Organic Chemistry I: Hydrocarbons & Crude Oil
Diagram
Solution
Is known as?
Attached Figure / Diagram
A
1-chloro-2-methylbutane
B
1-chloro-2-methylpropane
C
2-chloromethylpropane
D
1-chloro-2, 2-dimethylethane
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
While naming the compound, first identify the longest Carbon chain - Propane
Secondly, identify the substituent groups, i.e the functional groups - There are two substituents present, Chloro (on Carbon- 1) and Methyl (On carbon - 2)
Alphabetically, Chloro comes before methyl, hence the naming will take the form 1-chloro, 2-methyl
Finally, bring all the names together, starting with the substituents, i.e 1-chloro,2-methyl propane
Source: Myschool Past Questions Archive (Record #13111)
Chemistry
UTME / JAMB 1991
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which of the following statements is TRUE of the complete hydrolysis of a glycerine by sodium hygroxide?
A
3 moles ofNaOH are required for each mole of glyceride
B
3 moles of glycerol are produced
C
Only one mole of soap is formed
D
concentrated H2SO4 is essential for the completion of the reaction
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 #13112)
Chemistry
UTME / JAMB 1991
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following are the products of the reaction between CH3COOH and CI2 in sunlight?
A
CICH2COOH + HCI
B
CH3COCI + HOCI
C
CH3COOCI + HCI
D
CH3COCI + HO2
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 #13115)
Chemistry
UTME / JAMB 1991
Acids, Bases, pH & Salts
Which of these is an acid salt?
A
K2SO4-.AI2(SO4)3.24H2O
B
CuCO3.Cu(OH)2
C
NaHS
D
CaOCI2-
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 #13166)
Chemistry
UTME / JAMB 1991
Acids, Bases, pH & Salts
Solution
The appropriate test paper to use in the above experiment is moist
A
litmus psper
B
potassium heptaoxodichromate (IV) paper
C
lead (ll) trioxonitrate (V) paper
D
universal indicator paper
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Hydrogen Sulphide can easily be identified by bringing a strip of filter paper soaked in Lead(II) ethanoate solution or Lead(II) nitrate(V) solution into the gas.
H\(_2\)S turns the paper dark brown or black. The change in colour is as a result of formation of precipitate of black lead(II) Sulphide.
Source: Official Exam / Past Question Archive
Chemistry
UTME / JAMB 1991
Chemical Bonding & Intermolecular Forces
Diagram
Solution
The electrons of two atoms Y and Z are arranged in shells as shown above. The bond formed between the atoms of Y and Z is
Attached Figure / Diagram
A
ionic
B
covalent
C
dative
D
metallic
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Element Y is Silicon
Element Z is Chlorine
Silicon reacts with chlorine to form the covalent compound SiCl4
Source: Myschool Past Questions Archive (Record #31446)
Chemistry
UTME / JAMB 1991
Non-Metals & Their Compounds
Diagram
50 cm3 of sulphur (lV) oxide, 800 cm3 of carbon (IV) oxide will respectively saturate 1.0cm3 of water at 15oC. Which of the following is suitable for demonstrating the fountain experiment?
Attached Figure / Diagram
A
Sulphur (IV) oxide and hydrogen chloride.
B
Carbon (IV) oxide and ammonia
C
Ammonia and hydrogen chloride
D
Carbon (IV) oxide and Sulphur (IV) 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 #31448)
Chemistry
UTME / JAMB 1991
Reaction Rates & Chemical Equilibrium
Diagram
Solution
The data in the table above shows the rate of reaction of nitrogen (ll) oxide with chlorine at 25oC It can be concluded that doubling the initial concentration of NO increase the rate of reaction by a factor of
Attached Figure / Diagram
A
two
B
three
C
four
D
five
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
3.0 x 10-5 x 4 = 1.2 x 10-4
.: The rate increase by a factor of 4
Source: Myschool Past Questions Archive (Record #31449)
Chemistry
UTME / JAMB 1991
Acids, Bases, pH & Salts
Diagram
Solution
The appropriate test paper to use in the above experiment is moist
Attached Figure / Diagram
A
litmus psper
B
potassium heptaoxodichromate (IV) paper
C
lead (ll) trioxonitrate (V) paper
D
universal indicator paper
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Hydrogen Sulphide can easily be identified by bringing a strip of filter paper soaked in Lead(II) ethanoate solution or Lead(II) nitrate(V) solution into the gas.
H\(_2\)S turns the paper dark brown or black. The change in colour is as a result of formation of precipitate of black lead(II) Sulphide.
Source: Myschool Past Questions Archive (Record #31450)
Chemistry
WAEC / WASSCE 1991
Metals, Transition Elements & Extraction
The metal extracted from cassiterite is
A
calcium
B
copper
C
tin
D
sodium
E
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 #36121)
Chemistry
WAEC / WASSCE 1991
Oxidation, Reduction & Redox Reactions
In which of the following is the oxidation number of nitrogen zero?
A
SO2 and NH3
B
NaNO3
C
HNO2
D
NOI3
E
N2
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 #36122)
Chemistry
WAEC / WASSCE 1991
Water, Solutions & Solubility
The separation of a mixture of calcium trioxocarbonate (lV) and sodium trioxocarbonate (IV) is most easily carried out by using the differences in their
A
physical states
B
melting points
C
Rf. values
D
solubility
E
boiling points
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 #36123)
Chemistry
WAEC / WASSCE 1991
Periodic Table & Periodicity
When air is passed through a heated tube containing finely divided copper, the component that is absorbed in the process is
A
carbon (IV) oxide
B
nitrogen
C
oxygen
D
water vapour
E
noble gases
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 #36124)
Chemistry
WAEC / WASSCE 1991
Stoichiometry, Mole Concept & Volumetric Analysis
What is the amount (in mole) of sodium trioxocarbonate (IV) in 5.3 g of the compound? (Na2CO3 = 106)
A
0.05
B
0.10
C
0.20
D
0.50
E
2.00
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 #36125)