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Chemistry UTME / JAMB 2020 Stoichiometry, Mole Concept & Volumetric Analysis
Aluminum hydroxide is used in the dyeing industry as a?
A
Dye
B
Dispersant
C
Salt
D
Mordant
medium Difficulty
Chemistry UTME / JAMB 2020 Stoichiometry, Mole Concept & Volumetric Analysis
The most important element on the earth's crust is?
A
Nitrogen
B
Hydrogen
C
Oxygen
D
Fluorine
medium Difficulty
Chemistry UTME / JAMB 2020 Stoichiometry, Mole Concept & Volumetric Analysis
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
Chemistry WAEC / WASSCE 2020 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which or the following substances is a polypeptide?
A
Starch
B
Glycogen
C
Protein
D
Fats
medium Difficulty
Chemistry WAEC / WASSCE 2020 Stoichiometry, Mole Concept & Volumetric Analysis
Which or the following products could be formed during incomplete combustion of a hydrocarbon. i.Carbon ii. Hydrogen III. Carbon (Il) oxide
A
I only
B
I and II only
C
I and III only
D
II and III only
medium Difficulty
Chemistry WAEC / WASSCE 2020 Stoichiometry, Mole Concept & Volumetric Analysis
What quantity of electrons is lost when one mole of iron (II) ions is oxidized to iron (III) ?
A
0 mole
B
I mole
C
2 moles
D
3 moles
medium Difficulty
Chemistry WAEC / WASSCE 2020 Electrolysis & Electrochemical Cells
What is the mass of silver deposited when 24,125 C of electricity is passed through a solution or silver salt. [Ag = 108, IF = 96,500 C ]
A
432g
B
108g
C
54g
D
27g
medium Difficulty
Chemistry WAEC / WASSCE 2020 Reaction Rates & Chemical Equilibrium
Equal masses of calcium trioxocarbonate(iv) were added to dilute hydrochloric acid at the temperature specified. Under which of the following conditions would the reaction be slowest?
A
Calcium trioxocarbonate ( iv ) chips a 20°C
B
CalcIum trioxocarbonate (IV) chips at 40°C
C
Calcium trioxocarbonate (IV) powder at 20'C
D
Calcium trioxocarbonate (IV) powder at 40'C
medium Difficulty
Chemistry WAEC / WASSCE 2020 Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following substances is an example of a fine chemical?
A
Sodium hydroxide
B
Hydrochloric acid
C
Ethylene
D
Ammonia
medium Difficulty
Chemistry WAEC / WASSCE 2020 Stoichiometry, Mole Concept & Volumetric Analysis
The IUPAC name of the compound represented by the structure below is ?
Attached Figure / Diagram
Question diagram
A
2- chloro but-I ,3-diene.
B
But-1,3-chlorodiene.
C
2-chloro but-diene.
D
3 -chloro but -1.3-diene.
medium Difficulty
Chemistry WAEC / WASSCE 2020 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The high solubility of ethanol in water is due to?
A
its low boiling point.
B
its low freezing point.
C
its covalent nature
D
hydrogen bonding
medium Difficulty
Chemistry WAEC / WASSCE 2020 Periodic Table & Periodicity
Which of the following pairs of properties of alkali metals decreases down the group?
A
First ionization energy and reactivity
B
melting point and atomic radius
C
Reactivity and electronegativity
D
First ionization energy and melting point
medium Difficulty
Chemistry WAEC / WASSCE 2020 Nature of Matter & Separation Techniques
The most suitable process of obtaining water from an aqueous solution of sugar i
A
Crystallization
B
Distillation
C
Filtration
D
Decantation
medium Difficulty
Chemistry WAEC / WASSCE 2020 Chemical Bonding & Intermolecular Forces
When an ionic bond is broken, bonding electrons are
A
shared between participating atoms
B
gained by the most electropositive atom
C
gained by the most electronegative atom
D
lost by both participating atoms.
medium Difficulty
Chemistry WAEC / WASSCE 2020 Oxidation, Reduction & Redox Reactions
The oxidation state of chlorine in NaClO\(_3\) is?
A
+1
B
+3
C
+5
D
+6
medium Difficulty
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