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Chemistry
UTME / JAMB 2022
Carbon Carbon Compounds
Solution
The pollutant usually presents in a city which generates its electricity from coal?
A
fog
B
carbon(ii)oxide
C
smog
D
sulphur(iv)oxide
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
In the majority of power plants, sulfur appears due to coal burning which is used to generate electricity.
Source: WAEC / JAMB / NECO Classroom Archive (Record #64978)
Chemistry
UTME / JAMB 2022
Carbon Carbon Compounds
Solution
How many bonding pair are present in carbon(iv)oxide?
A
4
B
3
C
2
D
1
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
There are 4 bond pairs in CO₂ and no lone pairs are there.
Source: WAEC / JAMB / NECO Classroom Archive (Record #65005)
Chemistry
UTME / JAMB 2022
Sulphur Sulphur Compounds
Solution
SO\(_2\) + O\(_2\) → 2SO\(_3\)
In the reaction above, the most suitable catalyst is?
A
chromium(vi)oxide
B
iron(iii)oxide
C
copper(i)oxide
D
vanadium(v)oxide
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
During the Contact Process for manufacturing sulfuric acid, sulfur dioxide has to be converted into sulfur trioxide, which is done by passing sulfur dioxide and oxygen over a solid vanadium(V) oxide catalyst.
Source: WAEC / JAMB / NECO Classroom Archive (Record #64902)
Chemistry
UTME / JAMB 2022
Sulphur Sulphur Compounds
Solution
The sulphide that is commonly used in coating electric fluorescent tubes is?
A
iron(ii)Sulphide
B
tin(ii)sulphide
C
Zinc Sulphide
D
lead(iv) Sulphide
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
ZnS (Zinc Sulfide) screen was used because it emits a flash of light when struck by an alpha particle.
This is a phenomenon called Radio luminescence in which a flash of light is observed on the screen when acted upon by a radioactive substance.
Source: WAEC / JAMB / NECO Classroom Archive (Record #64907)
Chemistry
UTME / JAMB 2022
Transition Metals and Their Compounds
Solution
Using the metal activity series, the metal that can liberate hydrogen gas from steam is?
A
iron
B
copper
C
tin
D
lead
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Iron reacts with steam to form iron oxide and hydrogen gas.
Source: WAEC / JAMB / NECO Classroom Archive (Record #64926)
Chemistry
UTME / JAMB 2022
Transition Metals and Their Compounds
Solution
Zn + 2HCL → ZnCl\(_2\) + H\(_2\)
What happens to zinc in the above reaction?
A
oxidized
B
a reactant
C
reduced
D
a metal
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
-Zn is a reducing agent, HCl is an oxidizing agent.
-the zinc is oxidized
Source: WAEC / JAMB / NECO Classroom Archive (Record #64938)
Chemistry
UTME / JAMB 2022
Transition Metals and Their Compounds
Solution
Wrought iron is obtained by heating cast iron in a furnace with?
A
magnetite
B
haematite
C
carbon(ii)oxide
D
calcium trioxosilicate(iv)
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Cast iron + haematite = wrought iron
Source: WAEC / JAMB / NECO Classroom Archive (Record #65002)
Chemistry
UTME / JAMB 2022
Transition Metals and Their Compounds
Solution
In the extraction of iron, hot air is introduced into the blast furnace through?
A
valves
B
open-hearths
C
arcs
D
tuyeres
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Pre-heated air at about 600ºC is blown into the furnaces from the bottom through the tuyeres.
Source: WAEC / JAMB / NECO Classroom Archive (Record #65003)
Chemistry
UTME / JAMB 2022
Organic Chemistry
Solution
An organic compound which liberate carbon(iv)oxide from trioxocarbonate(iv) solution is likely to be?
A
C\(_2\)H\(_5\)OH
B
C\(_3\)H\(_4\)
C
C\(_6\)H\(_6\)
D
CH\(_3\)COOH
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Carboxylic acids and enols react with sodium bicarbonate to liberate carbon dioxide.
E,g CH\(_3\)COOH
Source: WAEC / JAMB / NECO Classroom Archive (Record #64909)
Chemistry
UTME / JAMB 2022
Organic Chemistry
Solution
The dehydration of CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)OH will give?
A
HC≡CCH\(_2\)CH\(_3\)
B
CH\(_2\)≡CH\(_2\)CH\(_3\)
C
CH\(_3\)C≡CCH\(_3\)
D
CH\(_3\)CH=CHCH\(_3\)
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
An alkene is produced when dehydration of alcohol is performed. Alcohol dehydration is an example of an elimination reaction which is quite the opposite of substitution reaction and addition reaction.
The products of the dehydration of a primary alkanol are water and an alk-1-ene (1-alkene).
Butanol gives a mixture of but-1-ene and but-2-ene when dehydrated.
Source: WAEC / JAMB / NECO Classroom Archive (Record #64985)
Chemistry
UTME / JAMB 2022
Hydrocarbons
Diagram
Solution
The IUPAC nomenclature of the structure is?
Attached Figure / Diagram
A
3-chloro-3-methylbutane
B
2,2,-dichloro-3-methylbutane
C
3-methylchlorobutane
D
2-chloro-2-methylbutane
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Straight-chain hydrocarbon molecules that contain only singly-bonded carbons are called alkanes.
When naming these molecules, the final syllable in their name is "ane."
Find and name the longest continuous carbon chain.
Identify and name groups attached to this chain.
Number the chain consecutively, starting at the end nearest a substituent group.
Designate the location of each substituent group by an appropriate number and name.
Source: WAEC / JAMB / NECO Classroom Archive (Record #64901)
Chemistry
UTME / JAMB 2022
Hydrocarbons
Solution
Alkanes are used mainly?
A
in the textile industry
B
in the hydrogenation of oils
C
as domestic and industrial fuels
D
as fine chemicals
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Alkanes are very useful as fuels.
Source: WAEC / JAMB / NECO Classroom Archive (Record #65017)
Chemistry
UTME / JAMB 2022
Basic Concepts of Organic Chemistry
Solution
2-methylprop-1-ene is a structural isomer of?
A
But-1-yne
B
2-methyl But-1-ene
C
3-methyl prop-1-yne
D
But-2-ene
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Isomers of Butene: are But-1-ene, But-2-ene, 2-Methylpropene or 2-methylprop-1-ene
Source: WAEC / JAMB / NECO Classroom Archive (Record #65010)
Chemistry
UTME / JAMB 2022
Organic Chemistry
Solution
A chemical widely used as a fertilizer is?
A
galena
B
bauxite
C
emerald
D
nitrochalk
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Calcium ammonium nitrate or CAN, also known as nitro-limestone or nitrochalk, is a widely used inorganic fertilizer.
Source: WAEC / JAMB / NECO Classroom Archive (Record #64914)
Chemistry
UTME / JAMB 2022
Organic Chemistry
Solution
An organic functional group which can likely decolorize ammoniacal silver nitrate is?
A
alkene
B
alkane
C
alkyne
D
alkanol
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Terminal alkynes react with Tollens reagent (ammoniacal silver nitrate solution) to form silver alkynides as a white precipitate, whereas internal alkynes do not react with Tollens reagent.
Source: WAEC / JAMB / NECO Classroom Archive (Record #64941)