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Chemistry
UTME / JAMB 1980
Electrolysis & Electrochemical Cells
Solution
Which of the following statements is true?
A
Metals conduct electricity while non-metals do not
B
Metals have high density, non-metals have low density
C
Metals form basic oxides, non-metals form acidic oxides
D
In the electro chemical series, metals are above hydrogen while non-metals are below hydrogen
E
Metals lose elections while non-metals gain electron during chemical reactions
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
Not all metals are above hydrogen in the electrochemical series. The electrochemical series, also known as the activity series, lists metals in order of decreasing reactivity. Metals above hydrogen are more reactive than hydrogen, while metals below hydrogen are less reactive. Copper and silver are examples of metals that are below hydrogen in the electrochemical series.
Conversely, all metals lose electrons or donate electrons because they are highly electropositive, hence they are reducing agents while non-metals are electron receptors, as they gain electrons during chemical reaction.
Source: Myschool Past Questions Archive (Record #12827)
Chemistry
UTME / JAMB 1980
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The boiling point of water is higher than that of methanol because?
A
water is oxide while methanol is an alcohol
B
inter molecular forces in water are stronger than those in methanol
C
water is an inorganic compound while methanol is organic
D
water is an ionic compound while methanol is a covalent compound
E
water is more reactive than methanol
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 #14284)
Chemistry
UTME / JAMB 1980
Periodic Table & Periodicity
Solution
Element X has a total of 19 electrons and can react with oxygen to form an oxide. Which of the following statements is NOT true of the oxide of the element?
A
When exposed to air, it slowy changes to liquid
B
its solution in water conducts electricity
C
Its solution in water, on evaporationm gives a white solid
D
Its solution in water liberates hydroge when in contact with aluminium metal
E
Its oxide, when stronlgy heated, regenerates the elements X
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
Identification of Element X: Element X has 19 electrons, identifying it as Potassium (K), an alkali metal in Group 1 of the periodic table.
Reaction with Oxygen: Potassium reacts with oxygen to form potassium oxide (K\(_2\)O).
Thermal Stability: Oxides of Group 1 metals like potassium are extremely stable due to their high lattice energy and the strong electropositive nature of the metal. They do not decompose back into the metal and oxygen simply by heating; instead, potassium is typically obtained through electrolysis.
Source: Myschool Past Questions Archive (Record #14287)
Chemistry
UTME / JAMB 1980
Periodic Table & Periodicity
Solution
Which ONE of the following statements is true?
A
All alkali metals salts dissolves with dissociation in water
B
Most ionic substances are easily vaporized
C
Ionic substances exist only as liquid
D
Non-ionic substances are good electrolytes
E
Nitrogen exists in a trivalent state in ammonium salts
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
All alkali metal salts are soluble in water.
Source: Myschool Past Questions Archive (Record #14289)
Chemistry
UTME / JAMB 1980
Organic Chemistry I: Hydrocarbons & Crude Oil
When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called?
A
substitution
B
addition
C
polymerization
D
hydrolysis
E
reduction
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 #14290)
Chemistry
UTME / JAMB 1980
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
20 cm3 of 1 M H\(_2\)SO\(_4\) is mixed 20 cm\(^3\) of 1 M NaOH. The resulting solution is?
A
acidic with a molarity of 0.50 M H2SO4
B
acidic with a molarity of 0.25 H2SO4
C
neutral
D
alkaline with a molarity of 0.25 M NaOH
E
alkaline with a molarity of 0.50 M NaOH
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The balanced equation for the reaction is:
\(2NaOH + H_2 SO_4 \to Na_2 SO_4 + 2H_2 O\)
\(\therefore 1M H_2 SO_4 \to 2M NaOH\)
\(1M NaOH \to 0.5M H_2 SO_4\)
The resulting solution is Acidic with 0.5M H\(_2\)SO\(_4\).
Source: Myschool Past Questions Archive (Record #14291)
Chemistry
UTME / JAMB 1980
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
Which of the following is acceptable as the organic product of the reaction of ethanoic acid and ethanol with an acid catalyst?
A
Ethyl ethanoate
B
Methyl ethanoate
C
Ethyl methyl ketone
D
Butanol
E
None
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
This is an ESTERIFICATION REACTION of Alkanoic acid and Alkanol to yield an Ester
Source: Myschool Past Questions Archive (Record #14294)
Chemistry
UTME / JAMB 1980
Atomic Structure, Orbitals & Nuclear Chemistry
Given the mean atomic mass of chlorine prepared in the laboratory to be 35.5 and assuming that chlorine contains two isotopes of mass number 35 nad 37, what is the percentage composition of the isotope of mass number 35?
A
20
B
25
C
50
D
75
E
90
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 #14300)
Chemistry
UTME / JAMB 1980
Oxidation, Reduction & Redox Reactions
In which of the following is the oxidation state of oxygen different from its value in water?
A
OH-
B
H3O+
C
O-
D
H2O2
E
SO2
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 #14303)
Chemistry
UTME / JAMB 1980
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following silver halides is readily soluble in ammonium hydroxide?
A
Agl
B
AgBr
C
AgCl
D
AgF
E
None of the above
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 #14304)
Chemistry
UTME / JAMB 1980
Electrolysis & Electrochemical Cells
The chemical reaction which takes place at the anode (positive electrode) in electrolysis is?
A
oxidation
B
hydrolysis
C
dissociation
D
reduction
E
disproportionation
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 #14307)
Chemistry
UTME / JAMB 1980
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate?
A
Electrons flow towards the zinc rod
B
The zinc rod dissolves
C
The temperature of the soil changes
D
The blue colour of the solution gradually disappears
E
Copper metal is deposited
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 #14309)
Chemistry
UTME / JAMB 1980
Stoichiometry, Mole Concept & Volumetric Analysis
Hardening of an oil may be achieved by?
A
boiling the oil with water
B
boiling the oil with a catalyst
C
treating the oil with sodium hydroxide
D
treating the oil with hydrogen and catalyst
E
distilling oil under reduced pressure
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 #14311)
Chemistry
UTME / JAMB 1980
Stoichiometry, Mole Concept & Volumetric Analysis
Hardening of an oil may achieved by?
A
boiling the oil with water
B
boiling the oil with a catalyst
C
treating the oil with sodium hydroxide
D
treating the oil with hydrogen and catalyst
E
distilling oil under reduced pressure
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 #14312)
Chemistry
UTME / JAMB 1980
Electrolysis & Electrochemical Cells
Solution
A cold aqueous solution of sodium chloride is electrolyzed using a graphite anode and an iron cathode. In the course of the electrolysis the electrolyte is continuously stirred. The liquid left after electrolysis will therefore consist of?
A
sodium hydroxide solution
B
chlorine water
C
pure water
D
sodium hypochlorite solution
E
hydrochloric acid solution
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
we take cold aqueous to be concentrated solution of NaCl.
NaCl → \(Na^+ + Cl^-\)
\(H_2O → H^+ + OH^-\)
H ion will be preferably discharged at the cathode while Cl ion will be discharged at the anode(due to high concentration)
Thus, NaOH is left in the solution.
Source: Myschool Past Questions Archive (Record #14315)