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Chemistry
WAEC / WASSCE 2004
Atomic Structure, Orbitals & Nuclear Chemistry
Which of the following equipment is not used to detect radioactivity?
A
Wilson cloud chamber
B
Geiger- muller counter
C
Mass spectrometer
D
Photographic plate
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 #37034)
Chemistry
WAEC / WASSCE 2004
Particulate Nature of Matter, Laws & Formulae
The method of collection of gases prepared in the laboratory depend on their
A
odour and atomicity
B
colour and odour
C
atomicity and density
D
solubility and density
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 #37035)
Chemistry
WAEC / WASSCE 2004
Acids, Bases, pH & Salts
Solution
Which of the following pairs of salts undergo hydrolysis?
A
AlCI3 and NH4CI
B
AICI3 and NaCI
C
FeCI3 and KCI
D
Na2SO4 and K2 SO4
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Salt hydrolysis is a reaction in which one of the ions from a salt reacts with water, forming either an acidic or basic solution.Salts can be hydrolyzed in water, If the salts at least consist of one weak base or weak acid, they can be hydrolyzed. On the other hand, if the salts are from a strong base and acid, they cannot be hydrolyzed.
Al and \(NH_4\) are from weak base \(Al(OH)_3\) and \(NH_4OH\) respectively while Cl is from a strong acid HCl
Source: Myschool Past Questions Archive (Record #37036)
Chemistry
WAEC / WASSCE 2004
Metals, Transition Elements & Extraction
The alloy used extensively in the building industry is
A
steel
B
bronze
C
duralumin
D
type metal
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 #37037)
Chemistry
WAEC / WASSCE 2004
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following salts is not prepared by precipitation?
A
Lead (ll) trioxocarbonate (lV)
B
Barium trioxocarbonate (IV)
C
Sodium trioxocarbnate (IV)
D
Calcium trioxocarbonate (IV)
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 #37038)
Chemistry
WAEC / WASSCE 2004
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
What volume of hydrogen would be left over when 300cm3 of oxygen and 1000cm of hydrogen are exploded in a sealed tube? [2H2(g) + O2(g) → 2H2 Og]
A
200 cm3
B
400 cm3
C
600cm3
D
700cm3
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
2H2(g) + O 2(g) → 2H2Og
2V IV 2V
600cm3 300cm3 600cm3
The volume of hydrogen left over
= 1000 - 600 = 400cm3?
Source: Myschool Past Questions Archive (Record #37039)
Chemistry
WAEC / WASSCE 2004
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
What are the values of x, y and z respectively in the following in the following equation? \(MnO_{2(s)} + xHCI_{(aq)} → MnCI_{2(g)} + yHO_{(l)} + zCI_{2(g)}\)
A
4,1,2
B
1,2,1
C
2,1,2
D
4,2,1
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
\(MnO_{2(s)} + xHCI_{(aq)} → MnCI_{2(g)} + yH_2O_{(l)} + zCI_{2(g)}\)
compare the number of each atom of the elements on both sides of the chemical equation.
x = 4, y = 2 and z = 1
Source: Myschool Past Questions Archive (Record #37040)
Chemistry
WAEC / WASSCE 2004
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following subtances will not produce effervescence with dilute hydeochloric acid?
A
Copper (ll) trioxocarbonate (IV)
B
Potassium hydrogentrioxocarbonate (lV)
C
Zinc granules
D
Sodium chloride
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 #37041)
Chemistry
WAEC / WASSCE 2004
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
What quantity of electrons in moles is needed to discharge two moles of aluminum from aluminum oxide (AI 2O3)
A
1
B
2
C
4
D
6
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
One mole of aluminium from aluminium oxide gives three elecrrons. Two moles of aluminium from aluminium oxide give six electrons
Source: Myschool Past Questions Archive (Record #37042)
Chemistry
WAEC / WASSCE 2004
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Two solutions containing Pb2+ and AI3+ respectively can be distinguished using
A
NaOH(aq)
B
NH3(aq)
C
conc. HCI3
D
conc. HCI
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
HCl (hydrochloric acid) can be used to distinguish between Pb\(^{2+}\) and Al\(^{3+}\) because lead ions (Pb\(^{2+}\)) form a white precipitate (PbCl\(_2\)) when reacted with HCl, while aluminum ions (Al\(^{3+}\)) do not.
Source: Myschool Past Questions Archive (Record #37043)
Chemistry
WAEC / WASSCE 2004
Stoichiometry, Mole Concept & Volumetric Analysis
A solution of zinc chloride should not be stored in a container made of
A
tin
B
copper
C
aluminium
D
lead
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 #37044)
Chemistry
WAEC / WASSCE 2004
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Glucose gives a brick-red precipitate with Fehling's solution because it is
A
carbohydrate
B
an alkanoate
C
a reducing sugar
D
a non-electrolyte
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 #37045)
Chemistry
WAEC / WASSCE 2004
Stoichiometry, Mole Concept & Volumetric Analysis
What is the IUPAC name of CH3CH2COOCH 3?
A
Ethylethanoate
B
Methylethanoate
C
Methylpropanoate
D
Propylmethanoate
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 #37046)
Chemistry
WAEC / WASSCE 2004
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The mass of 800cm3 of a gas X at s.t.p. is 1.0g. What is the molar mass of X? [1 mole of a gas at s.t.p occupies 22.4dm 3]
A
18.0g mol-1
B
22.4g mol-1
C
28.0gmol-1
D
36.0gmol-1
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The mass of 0.8dm3 of a gas at s.t.p. is 1.0g :. 22.4dm> of gas at s.t.p. will have a molar mass of 22.4/0.8 = 28.0g mol-1
Source: Myschool Past Questions Archive (Record #37047)
Chemistry
WAEC / WASSCE 2004
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which of the following compounds is a soapless detergent?
A
C 12H 25OSO3Na
B
C 17H 35COONa
C
C 6H5OH3
D
C 4H9COOC2H 5
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 #37048)