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 18631–18645 of 29821 verified questions
Sort by:
Chemistry
NECO SSCE 2001
Stoichiometry, Mole Concept & Volumetric Analysis
Which compound will have the lowest boiling point?
A
CH3OH
B
CH3COOH
C
CH3CHOH
D
C4H10
E
(CH3)3CH
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 #43347)
Chemistry
NECO SSCE 2001
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The molar mass of a compound X is 56. its empirical formula is CH2. X is
A
butene.
B
butyne.
C
ethene.
D
propene.
E
propyne
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
\((CH_{2})x = 56\)
\((12 + 2)x = 56\)
\(14x = 56\)
\(x = \frac{56}{14}\)
\(x = 4\)
Hence, the empirical formula is \((CH_{2}) \times 4\)
= \(C_{4}H_{8}\)
Source: Myschool Past Questions Archive (Record #43348)
Chemistry
NECO SSCE 2001
Kinetic Theory of Matter & Gas Laws
The Kinetic theory can NOT be used to explain
A
allotropy.
B
Brownian movement.
C
diffusion.
D
Tyndal effect.
E
vaporization.
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 #43349)
Chemistry
NECO SSCE 2001
Stoichiometry, Mole Concept & Volumetric Analysis
The best way to distinguish between Na2CO3and NaHCO2 is by.
A
adding an acid.
B
adding an alkali.
C
dissolving in water.
D
exposing to air.
E
heating.
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #43350)
Chemistry
NECO SSCE 2001
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?
A
I and II
B
I and III
C
I and IV
D
II and III
E
II and IV
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 #43351)
Chemistry
NECO SSCE 2001
Electrolysis & Electrochemical Cells
Faraday s first law of electrolysis can be expressed mathematically as
A
m=I/it
B
mαit
C
Q=it
D
QαI/it
E
Qαit
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 #43352)
Chemistry
NECO SSCE 2001
Particulate Nature of Matter, Laws & Formulae
A gas X diffuse through porous partition at the rate of 3 cm3 per second. Under the same condition hydrogen diffused at the rate of 15 cm3 per second.
What is the 42. relative molecular mass of X.
A
5
B
12
C
18
D
45
E
50
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #43353)
Chemistry
NECO SSCE 2001
Stoichiometry, Mole Concept & Volumetric Analysis
The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by
A
conversion.
B
elimination.
C
oxidation.
D
reduction.
E
substitution.
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 #43354)
Chemistry
NECO SSCE 2001
Stoichiometry, Mole Concept & Volumetric Analysis
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because
A
NaCl(s) is non-ionic but NaCl(aq) is ion
B
NaCl(aq) contains mobile electrons, where absent in NaCl(s).
C
NaCl(aq) contains mobile ions which Nacl,) does not contain.
D
NaCl(s) ionizes partiality while NaCl(aq) iodizes completely.
E
NaCl(s) decomposes when heated but NCl(aq) is stable to heat. –
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 #43355)
Chemistry
NECO SSCE 2001
Stoichiometry, Mole Concept & Volumetric Analysis
To test for the presence of chloride ions in ion, correct sequence of reagents to use is
A
Ba(NO3)2(aq) then HNO3(aq).
B
HCl(aq) then Ba(NO3)2(aq).
C
HCl(aq) then Ag3(aq).
D
HNO3(aq) then fresh FeSO4(aq).
E
HNO3(aq) then AgNO3(aq).
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #43356)
Chemistry
NECO SSCE 2001
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products?
A
boiling off the ethanoic
B
filtration
C
fractional crystallisation
D
fractional distillation
E
isomerisation
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 #43357)
Chemistry
NECO SSCE 2001
Reaction Rates & Chemical Equilibrium
Which method is NOT used to determine rate of a reaction?
A
change in amount of precipitate formed
B
change in equilibrium constant
C
change in intensity of colour
D
change in pH values.
E
change in total gas pressure
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 #43358)
Chemistry
NECO SSCE 2001
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Detergents are better than soaps for washing in hard water because
A
hard water contains insoluble calcium salts.
B
they contain bleaching powder.
C
they contain palmitic acid.
D
they do not form insoluble calcium and magnesium salts.
E
they are organic compounds.
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 #43359)
Chemistry
NECO SSCE 2001
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Fructose and glucose are
A
allotropes of each other.
B
both disaccharides
C
dimere of each other.
D
isomers of each other
E
isotopes of each other
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 #43360)
Chemistry
NECO SSCE 2001
Chemical Energetics & Thermochemistry
A measure of the degree of disorderliness in a chemical system is known as the
A
activation energy
B
enthalpy
C
entropy
D
equilibrium
E
free energy.
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 #43361)