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Chemistry
WAEC / WASSCE 1996
Non-Metals & Their Compounds
Solution
The existance of two or more forms of the same element in the same physical state is known as
A
allotropy
B
resonance
C
hybridization
D
isotopy
E
isomerism
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Allotropy or allotropism is the property of some chemical elements to exist in two or more different forms, in the same physical state.
Source: Myschool Past Questions Archive (Record #36443)
Chemistry
WAEC / WASSCE 1996
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
When an atom gains an electron, it becomes
A
chemically inactive
B
negatively charged
C
oxidized
D
a cation
E
a complex ion
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
When atom gains an electron, the number of electrons increases by one and it is more than number of proton. Thus, it becomes negatively charged, indicating that there are now more electrons in the atom than proton, since electrons are negatively charged.
Source: Myschool Past Questions Archive (Record #36444)
Chemistry
WAEC / WASSCE 1996
Periodic Table & Periodicity
The alkali metals exhibit similar chemical properties because
A
they occur in the combined state
B
they have the same number of vallence electrons
C
they form crystalline salts
D
their salts are soluble in water
E
they are highly reactive
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 #36445)
Chemistry
WAEC / WASSCE 1996
Stoichiometry, Mole Concept & Volumetric Analysis
What is the likely formula of compound formed between element M in group two and element X in group seven?
A
M7X2
B
M2X
C
M2X7
D
MX2
E
MX6
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 #36449)
Chemistry
WAEC / WASSCE 1996
Kinetic Theory of Matter & Gas Laws
''Equal volumes of all gases at the same temperature and pressure contain the same number of molecules'' is an expression of
A
Charles Law
B
Boyle's Law
C
Avogadro's Law
D
Graham's Law
E
Gay Lussac's Law
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 #36450)
Chemistry
WAEC / WASSCE 1996
Kinetic Theory of Matter & Gas Laws
Solution
What volume of carbon (lV) oxide is produced at s.t.p. when 2.5g of CaCO3 reacts with excess acid according to the following equation? CaCO3 + 2HCI → CaCI2 +H2O + CO2 [CaCO3 = 100; molar volume of a gas at s.t.p = 22.4dm3]
A
11.20dm3
B
5.60dm3
C
2.24dm3
D
0.56dm3
E
0.28dm3
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
CaCO3 + 2HCI → CaCI2 +H2O + CO2
Firstly, be sure that stoichiometrically, the equation is balanced. The ratio of CaCO3 to CO2 is 1:1
Secondly, what mass of CaCO3 will produce 22.4dm3 of CO2? (S.T.P)
To answer this question, calculate the molar mass of CaCO3 = 40 + 12 + (16X3) = 100g/mol
i.e 100g in 1 mol, which means the mass of CaCO3 that will produce 22.4 dm3 of CO2 at STP is 100g
If 100g of CaCO3 produces 22.4dm3 CO2
2.5g of CaCO3 will produce x dm3 CO2
Making x the subject of the relation, X = (2.5 X 22.4) / 100
x = 0.56dm3
Source: Myschool Past Questions Archive (Record #36452)
Chemistry
WAEC / WASSCE 1996
Stoichiometry, Mole Concept & Volumetric Analysis
A solution of pH 7 is
A
acidic
B
neutral
C
concentrated
D
dilute
E
saturated
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 #36454)
Chemistry
WAEC / WASSCE 1996
Acids, Bases, pH & Salts
Which of the following equations represents a neutralization reaction?
A
CaCI2 + 2HCI →CI2 +CaCI 2 + H2O
B
Na2O2 + H2SO4 → Na2SO4 + H2O2
C
H2SO4 + KOH → KHSO4 + H2 O
D
2Na + 2H2O → 2NaOH + H2
E
CuSO4 + 2NaOH → Cu(OH)2+ Na2SO4
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 #36457)
Chemistry
WAEC / WASSCE 1996
Acids, Bases, pH & Salts
Amphoteric oxides are oxides which
A
react with water to form acids
B
react with water to form alkali
C
show neither acid nor basic properties
D
react with acids alkalis
E
contain high proportion of oxygen
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 #36461)
Chemistry
WAEC / WASSCE 1996
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The following acids are monobasic except
A
trioxonitrate (V) acid
B
hydrochloric
C
ethanoic acid
D
tetraoxophosphorus (V) acid
E
dioxonitrate (lll) 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 #36464)
Chemistry
WAEC / WASSCE 1996
Electrolysis & Electrochemical Cells
An arrangement of two different metals in aqueous solutions of their salts to produce an electronic current is known as
A
electrochemical cell
B
activity series
C
thermocouple
D
voltameter
E
galvanometer
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 #36471)
Chemistry
WAEC / WASSCE 1996
Oxidation, Reduction & Redox Reactions
In which of the following compounds is the oxidation number of nitrogen equal to + 3?
A
NO 2
B
N 2O
C
NO
D
HNO2
E
HNO3
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 #36477)
Chemistry
WAEC / WASSCE 1996
Electrolysis & Electrochemical Cells
Which of the following statements is not correct about electrolysis?
A
Reduction occurs at the anode
B
Anions migrate to the anode
C
Positive ions migrate to the cathode
D
Concentration affects the discharge of ions
E
Electrolytes conduct electric current
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 #36478)
Chemistry
WAEC / WASSCE 1996
Reaction Rates & Chemical Equilibrium
Which of the following is not correct about a catalyst? It
A
remains unchanged chemically at the end of a reaction
B
helps to establish equilibrium faster reversible reaction
C
can start a chemical rection which will normally not take place
D
is usually specific in its action
E
alters the rate of chemical reaction
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 #36479)
Chemistry
WAEC / WASSCE 1996
Stoichiometry, Mole Concept & Volumetric Analysis
The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased by
A
cooling the reaction mixture
B
using zinc powder instead of zinc granules
C
using zinc rod instead of zinc granules
D
carrying out the reaction at a higher pressure
E
carrying out the reaction in a closed vessel
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 #36480)