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Chemistry
WAEC / WASSCE 1995
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
A positive brown ring test indicates the presence of
A
NO 3
B
Fe 3+
C
SO 2-3
D
CU+
E
NO- 2
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Brown ring test is used for the detection of nitrate ions in a solution. As the name suggests it detects presence of nitrate ions by formation of brown ring
Source: Myschool Past Questions Archive (Record #36391)
Chemistry
WAEC / WASSCE 1995
Oxidation, Reduction & Redox Reactions
Consider the reaction represented by the equation below: XO + YO → X + YO2 In the reaction, YO acts as
A
an acidic oxide
B
a basic oxide
C
a reducing agent
D
a weak base
E
an oxidizing agent
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 #36395)
Chemistry
WAEC / WASSCE 1995
Acids, Bases, pH & Salts
Alums are classified as
A
simple salt
B
acid salts
C
anhydrous salts
D
double salts
E
basic salts
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 #36396)
Chemistry
WAEC / WASSCE 1995
Acids, Bases, pH & Salts
Sodium chloride cannot conduct electricity in the solid state because it
A
is a normal salt
B
is highly soluble in water
C
is an electrovalent compound
D
does not have any effect on litmus
E
does not contain mobile ions
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 #36397)
Chemistry
WAEC / WASSCE 1995
Stoichiometry, Mole Concept & Volumetric Analysis
What mass of copper will be deposited by the liberation of Cu2+ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]
A
64g
B
32g
C
12.8g
D
6.4g
E
3.2g
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 #36402)
Chemistry
WAEC / WASSCE 1995
Chemical Energetics & Thermochemistry
Which of the following is not correct of the reaction represented by the equation below? 2C(s) + O2(g) → 2CO(g); ∆H = - xKJ
A
there is an increase in entropy ;
B
There is anincrease in gaseous volume
C
Carbon (lV) oxide is produced
D
The oxidation number of carbon increases from 0 to +2
E
The reaction is exothermic
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 #36404)
Chemistry
WAEC / WASSCE 1995
Acids, Bases, pH & Salts
H3O+(aq) + OH-(aq) → 2H2O(l). The heat change accompanying the process represented by the equation above is the heat of
A
neutralization
B
formation
C
solution
D
dilution
E
hydration
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 #36409)
Chemistry
WAEC / WASSCE 1995
Non-Metals & Their Compounds
The following statements about graphite are correct except that it
A
is used as a lubricant
B
has a network structure
C
contains mobile free electrons
D
is good conductor
E
is an allotrope of carbon
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 #36410)
Chemistry
WAEC / WASSCE 1995
Organic Chemistry I: Hydrocarbons & Crude Oil
Which of the following is hydrocarbons is unsaturated?
A
Ethane
B
Benzene
C
Propane
D
2 - methylbutane
E
2,2,4-trimethylpentane
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 #36411)
Chemistry
WAEC / WASSCE 1995
Non-Metals & Their Compounds
The following can be obtained directly from the destructive distillation of coal except
A
ammoniacal liquor
B
coke
C
producer gas
D
coal gas
E
coal tar
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 #36412)
Chemistry
WAEC / WASSCE 1995
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Fructose and glucose are classified as carbohydrates because they
A
are crystalline white solids
B
are energy -giving substances
C
are naturally occurring organic compounds
D
contain carbon oxygen and hydrogen
E
conform to the general formula Cx(H2O)y
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 #36413)
Chemistry
WAEC / WASSCE 1995
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
The gas produced when a mixture of sodium propanoate and soda lime is heated is
A
methane
B
pentane
C
ethane
D
butene
E
ethyne
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
So during the presence of methane, sodium ethanoate with soda lime is used, using sodium propanoate with sodium will produce ethane according to the equation below
\(\CH_3CH_2COONa + NaOH → C_2H_6 + Na_2CO_3\)\ + CO\(_2\)
There are two gases but from the options provided, ethane is the correct answer.
Source: Myschool Past Questions Archive (Record #36416)
Chemistry
WAEC / WASSCE 1995
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
In which of the following processes are larger molecules broken down into smaller molecules?
A
Vulcanization of rubber
B
Hydrogenation of palm oil
C
Hydrolysis of starch
D
Polymerization
E
Esterification
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 #36418)
Chemistry
WAEC / WASSCE 1995
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
The following alkanols will yield alkanoic acids on reacting with excess acidified K2Cr2O7 except
A
CH3CH2OH
B
(CH3)2CHCH2OH
C
(CH3)3CCH2OH
D
(CH3)3COH
E
CH3CH2CH2CH2OH
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
option D is a tertiary alkanol. tertiary alkanols are resistant to oxidation so cannot react with excess acidified \(K_2Cr_2O_7\) to give any product.
Source: Myschool Past Questions Archive (Record #36419)
Chemistry
WAEC / WASSCE 1995
Metals, Transition Elements & Extraction
Which of the following is an alloy of mercury?
A
Stainless steel
B
Soft solder
C
Coinage bronze
D
Amalgam
E
Duralumin
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 #36420)