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Chemistry
UTME / JAMB 2010
Chemical Energetics & Thermochemistry
Solution
If a reaction is exothermic and there is a great disorder, it means that?
A
the reaction is static
B
the reaction is in a state of equilibrium
C
there will be a large increase in free energy
D
there will be a large decrease in free energy
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
If a reaction is exothermic and there is a great disorder for a spontaneous reaction to occur, a large decrease in free energy is evident.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4488)
Chemistry
UTME / JAMB 2010
Chemical Energetics & Thermochemistry
Solution
2H2(g) + O2(g) ⇌ 2H2O(g) ΔH = -ve
what happens to the equilibrium constant of the reaction above if the temperature is increased?
A
it is unaffected
B
it becomes zero
C
it decrease
D
it increase
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
This given equation shows the forward reaction is exothermic, which means an increase in temperature will cause the equilibrium position to shift to left to favor reactant formation, i.e K decreases
Source: WAEC / JAMB / NECO Classroom Archive (Record #4491)
Chemistry
UTME / JAMB 2010
Reaction Rates & Chemical Equilibrium
Diagram
The graph above demonstrate the effect of?
Attached Figure / Diagram
A
surface area on the rate of reaction
B
catalyst on the rate of reaction
C
pressure on the rate reaction
D
concentration on the rate of 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: WAEC / JAMB / NECO Classroom Archive (Record #4490)
Chemistry
UTME / JAMB 2010
Reaction Rates & Chemical Equilibrium
Diagram
Solution
In the diagram above, the purpose of the asbestos to?
Attached Figure / Diagram
A
absorb impurities
B
catalyze the reaction
C
solidify the gas
D
dry the gas
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Catalyst like platinize asbestos or vanadium(v)oxide is required to speed up the combination to form sulphur(iv)oxide.
Source: WAEC / JAMB / NECO Classroom Archive (Record #31666)
Chemistry
UTME / JAMB 2010
Atomic Structure, Orbitals & Nuclear Chemistry
12D + 13T → 24He + 01n + energy
The reaction above illustrates?
A
alpha decay
B
artificial transmutation
C
nuclear fussion
D
nuclear fission
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: WAEC / JAMB / NECO Classroom Archive (Record #4472)
Chemistry
UTME / JAMB 2010
Non-Metals & Their Compounds
Solution
Carbon (II) oxide is considered dangerous if inhaled mainly because it?
A
can cause injury to the nervous system
B
competes with oxygen in the blood
C
competes with carbon (IV) oxide in the blood
D
can cause lung cancer
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Carbon monoxide is harmful when breathed because it displaces oxygen in the blood and deprives the heart, brain and other vital organs of oxygen.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4478)
Chemistry
UTME / JAMB 2010
Non-Metals & Their Compounds
Diagram
Solution
In the diagram above, the gas produced is?
Attached Figure / Diagram
A
NO
B
NO2
C
N2O
D
N2O4
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
In the laboratory, nitrogen monoxide (NO), also known as nitric oxide, is commonly prepared by the reduction of dilute nitric acid with copper, resulting in the formation of copper(II) nitrate, water, and nitrogen monoxide gas.
The chemical equation for this reaction is: 4HNO\(_3\) + Cu → Cu(NO\(_3\))\(_2\) + 2NO + 4H\(_2\)O
Source: WAEC / JAMB / NECO Classroom Archive (Record #31667)
Chemistry
UTME / JAMB 2010
Non-Metals & Their Compounds
The acid that is used to remove rust is?
A
boric
B
hydrochloric
C
trioxonitrate (V)
D
tetraoxosulphate (VI)
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: WAEC / JAMB / NECO Classroom Archive (Record #4479)
Chemistry
UTME / JAMB 2010
Non-Metals & Their Compounds
Solution
The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and?
A
tricloromethane
B
dichloromethane
C
tetrachloromethane
D
chloromethane
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Carbon tetrachloride ( IUPAC: Tetrachloromethane) CCl\(_4\), is the final product obtained in this substitution reaction.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4504)
Chemistry
UTME / JAMB 2010
Non-Metals & Their Compounds
Solution
The haloalkanes used in dry-cleaning industries are?
A
trichloromethane and tetrachloromethane
B
chloroethene and dichloroethene
C
trichloroethene and tetrachloroethene
D
chloroethane and dichloroethene
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
- Both trichloromethane and tetrachloromethane are such important organic solvent.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4685)
Chemistry
UTME / JAMB 2010
Metals, Transition Elements & Extraction
Solution
A constituent common to bronze and solder is?
A
lead
B
silver
C
copper
D
tin
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
- bronze, alloy traditionally composed of copper and tin.
- Solder is an alloy, made from the elements, tin and lead.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4494)
Chemistry
UTME / JAMB 2010
Metals, Transition Elements & Extraction
Solution
Stainless steel is used for making?
A
magnets
B
tools
C
coins and medals
D
moving parts of clocks
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
- Stainless steel is an alloy of iron, nickel and chromium. It is used in making cutlery, tools and surgical equipment.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4497)
Chemistry
UTME / JAMB 2010
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
Which of the following organic compounds is very soluble in water?
A
CH3COOH
B
C2H2
C
C2H4
D
CH3COOC2H5
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Ethanoic acid ( CH\(_3\)COOH ) is the only organic compound listed here that is (very) soluble in water.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4501)
Chemistry
UTME / JAMB 2010
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
Which of the following is used in rocket fuels?
A
HNO3
B
CH3COOH
C
H2SO4
D
HCl
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
- Due to its unique powerful oxidizing nature, Nitric acid is often used in rocket fuels as a propeller
NB: Ethanol (not Ethanoic acid) is used alone or mixed with petrol as fuel for racing cars and in rockets.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4493)
Chemistry
UTME / JAMB 2010
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
The residual solids from the fractional distillation of petroleum are used as?
A
coatings of pipes
B
raw materials for the cracking process
C
fuel for the driving tractors
D
fuel for jet engines
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Other residues (apart from bitumen) are used as fuel, pipe coating, etc
Source: WAEC / JAMB / NECO Classroom Archive (Record #4498)