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Chemistry
UTME / JAMB 2020
Chemical Bonding & Intermolecular Forces
Solution
Which of the following types of bonding does not involve the formation of new substances?
A
Metallic
B
Covalent
C
Co-ordinate
D
Electrovalent
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
metallic bond does not involve the formation of a new substance. It is responsible for several characteristic properties of metals such as their shiny lustre, their malleability, and their conductivities for heat and electricity
Source: Myschool Past Questions Archive (Record #56812)
Chemistry
UTME / JAMB 2020
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be?
A
Alkene
B
Alkanal
C
Alkanone
D
Alkanoic Acid
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
alkanone & alkanal react with HCN to form compounds known as cyanohyderins. They also react with hydroxylamine to form oximes.
Source: Myschool Past Questions Archive (Record #56813)
Chemistry
UTME / JAMB 2020
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
The substance often used for vulcanization of rubber is?
A
Chlorine
B
Hydrogen peroxide
C
Sulphur
D
Tetraoxosulphate(vi) acid
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
One of the several uses of sulfur is for the vulcanization of rubber.
Source: Myschool Past Questions Archive (Record #56814)
Chemistry
UTME / JAMB 2020
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
The chlorinated alkane often used industrially to remove grease is?
A
Tetrachloromethane
B
Chloromethane
C
Trichloromethane
D
Dichloromethane
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Tetrachloromethane ( carbon tetrachloride) is an effective solvent within the chemical industry and is used to clean machinery and electrical equipment.
I.e as a solvent for oils, fats, lacquers, varnishes, rubber waxes, and resins, and as a grain fumigant.
Source: Myschool Past Questions Archive (Record #56815)
Chemistry
UTME / JAMB 2020
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
A
8.0g
B
16.0g
C
36.0g
D
72.0g
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
2H\(_2\) + O\(_2\) ⇒ 2H\(_2\)O
From the equation:
4g of Hydrogen produces 36g of water
: 8g of Hydrogen will produce 72g of water
Source: Myschool Past Questions Archive (Record #56816)
Chemistry
UTME / JAMB 2020
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
Proteins in acid solution undergo?
A
Substitution
B
Fermentation
C
Hydrolysis
D
Polymerisation
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Acid hydrolysis refers to a hydrolysis reaction occurring under acidic conditions. Acid hydrolysis of a protein breaks the polymer down into its constituent amino acids.
Source: Myschool Past Questions Archive (Record #56817)
Chemistry
UTME / JAMB 2020
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
The general formula for the Alkanals is?
A
R\(_2\)CO
B
RCHO
C
ROH
D
RCOOR
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Alkanals or Aldehydes have the general formula RCHO while Alkanones or Ketones have the general formula RCOR'.
Where R and R' may be alkyl or aryl groups.
Source: Myschool Past Questions Archive (Record #56818)
Chemistry
UTME / JAMB 2020
Electrolysis & Electrochemical Cells
Solution
When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?
A
Bipolar
B
Negatively charged
C
Positively charged
D
Neutral
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
When these cathode rays are deflected onto an electrode of an electrometer, the instrument measured a negative charge. The rays tested also were deflected by application of an electric field.
Source: Myschool Past Questions Archive (Record #56819)
Chemistry
UTME / JAMB 2020
Nature of Matter & Separation Techniques
Solution
When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?
A
Sublimation
B
Crystallization
C
Distillation
D
Evaporation
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state.
Source: Myschool Past Questions Archive (Record #56820)
Chemistry
UTME / JAMB 2020
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
An electron can be added to a halogen atom to form a halide ion with?
A
8 valence electrons
B
7 valence electrons
C
2 valence electrons
D
3 valence electrons
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
A halide ion is a halogen atom bearing a negative charge (which is an anion with a charge of -1). The halide anions are fluoride (F−), chloride (Cl−), bromide (Br−), iodide (I−) and astatide (At−).
Source: Myschool Past Questions Archive (Record #56821)
Chemistry
UTME / JAMB 2020
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Aluminum hydroxide is used in the dyeing industry as a?
A
Dye
B
Dispersant
C
Salt
D
Mordant
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Aluminum hydroxide is also used as a mordant in dyeing.
Source: Myschool Past Questions Archive (Record #56822)
Chemistry
UTME / JAMB 2020
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The most important element on the earth's crust is?
A
Nitrogen
B
Hydrogen
C
Oxygen
D
Fluorine
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Oxygen, O2, is by far the most abundant element in earth's crust at 46.6 percent, nearly half of the mass of the crust.
Source: Myschool Past Questions Archive (Record #56823)
Chemistry
UTME / JAMB 2020
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?
A
Passed over heated copper(ii)oxide
B
Bubbled through water
C
Bubbled through conc H\(_2\)SO\(_4\)
D
Bubbled through conc NAOH
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Carbon(ii)oxide is prepared from carbon(iv)oxide by passing the latter through red-hot carbon and the unchanged CO\(_2\) is removed when the mixture of the gases through conc NaOH.
Source: Myschool Past Questions Archive (Record #56824)
Chemistry
UTME / JAMB 2020
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?
A
Passed over heated copper(ii)oxide
B
Bubbled through water
C
Bubbled through conc H\(_2\)SO\(_4\)
D
Bubbled through conc NAOH
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Carbon(ii)oxide is prepared from carbon(iv)oxide by passing the latter through red-hot carbon and the unchanged CO\(_2\) is removed when the mixture of the gases through conc NaOH.
Source: Official Exam / Past Question Archive
English Language
UTME / JAMB 2020
Reading Comprehension, Summary & Composition
Solution
Theatre was popular in Africa because__________
A
was traditional and simple in nature
B
dealt with the political, social, and economic problems of the society
C
was a source of fun
D
was communal and reflected the common concerns of the people
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
In the passage, paragraph one emphasizes on community participation, peace and progress.
Option D is the correct answer
Source: Myschool Past Questions Archive (Record #56628)