Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 8341–8355 of 29821 verified questions
Sort by:
Chemistry
WAEC / WASSCE 2015
Water, Solutions & Solubility
A change in the temperature of a saturated solution disturbs the equilibrium between the
A
Undissolved solute and the solvent
B
Dissolved solute and the solvent
C
Dissolved solute and the undissolved solute
D
Dissolved solute and the solution
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 #45823)
Chemistry
WAEC / WASSCE 2015
Electrolysis & Electrochemical Cells
Which of the following statements about an electrochemical cell is correct? Oxidation occurs
A
At the anode
B
At the cathode
C
Through the salt bridge
D
In the aqueous solution
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 #45824)
Chemistry
WAEC / WASSCE 2015
Stoichiometry, Mole Concept & Volumetric Analysis
Consider the following reaction equation:
CuO(s) + H2(g) \(\to\) Cu(s) + H2O(1)
Which substance is oxidized?
A
Cu
B
CuO
C
H2
D
H2O
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 #45826)
Chemistry
WAEC / WASSCE 2015
Oxidation, Reduction & Redox Reactions
Which of the following metals is the strongest reducing agent?
A
Sodium
B
Silver
C
Potassium
D
Copper
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 #45828)
Chemistry
WAEC / WASSCE 2015
Organic Chemistry I: Hydrocarbons & Crude Oil
The complete hydrogenation of benzene gives
A
Cyclohexene
B
Cyclohexane
C
Hexene
D
Hexane
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 #45829)
Chemistry
WAEC / WASSCE 2015
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
A compound has an empirical formular CH2O and molecular mass of 90.
[H = 1.00, C = 12.0, O = 16.0]
A
C4H10O2
B
C3H10O2
C
C3H6O3
D
C2H2O4
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
(CH2O)n = 90; (12 + (1 x 2) + 16)n = 90
(12 + 2 + 16)n = 90; 30n = 90; n = \(\frac{90}{30}\); n = 3
(CH2O)3 = Molecular formula ; = C3H6O3
Source: Myschool Past Questions Archive (Record #45831)
Chemistry
WAEC / WASSCE 2015
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which of the following reactions would take place when concentrated sodium hydroxide solution is added to palm oil?
A
Esterification
B
Neutralization
C
Polymerization
D
Saponification
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 #45833)
Chemistry
WAEC / WASSCE 2015
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Starch could be converted to glucose by the process of
A
Condensation
B
Dehydration
C
Fermentation
D
Hydrolysis
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 #45835)
Chemistry
WAEC / WASSCE 2015
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
Which of the following compounds is a secondary alkanol?
A
Ethanol
B
2-methylbutan-2-ol
C
3-methylpentan-2-ol
D
Propan-1-ol
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
A secondary alkanol has two alkyl groups attached to the carbon atom carrying the hydroxyl group. drawing the structures of the alkanol listed above option C is the correct answer.
Source: Myschool Past Questions Archive (Record #45837)
Chemistry
WAEC / WASSCE 2015
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following substances is a heavy chemical?
A
Ammonia
B
Barim Hydroxide
C
Hydrochloric acid
D
Tetraoxosulphate(VI)acid
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 #45838)
Chemistry
WAEC / WASSCE 2015
Water, Solutions & Solubility
Which of the following process does not take place in domestic water treatment?
A
Chlorination
B
Flocculation
C
Neutralization
D
Sedimentation
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 #45841)
Chemistry
WAEC / WASSCE 2015
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
A substance responsible for the sour taste of unripe orange is
A
Alkene
B
Alkanol
C
Alkanoic acid
D
Alkanoate
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 #45843)
Chemistry
WAEC / WASSCE 2015
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
Which of the following products of biotechnology can be used as a fuel in place of petrol?
A
Butane
B
Ethanol
C
Ethene
D
Propanol
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Ethanol can be used as a fuel in place of petrol. it is commonly produced through biotechnology processes such as the fermentation of sugars from crops like corn or sugarcane. Ethanol is used as a biofuel and can be blended with gasoline to create ethanol-gasoline blends.
Source: Myschool Past Questions Archive (Record #45845)
Chemistry
WAEC / WASSCE 2015
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which of the following polymers in thermosetting?
A
Bakelite
B
Nylon
C
Polypropene
D
Polystyrene
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 #45846)
Chemistry
WAEC / WASSCE 2015
Particulate Nature of Matter, Laws & Formulae
Which of the following gases is monoatomic?
A
Argon
B
Chlorine
C
Nitrogen
D
Oxygen
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 #45847)