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Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
Solution
Which of the following pollutants is associated with brain damage?
A
Carbon (ll) oxide
B
Radioactive fallout
C
Biodegradable waste
D
Sulphus (lV) oxide
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The correct answer is A.
CO (Carbon Monoxide) and also other pollutants like Particulate Matter (PM), Nitrogen Dioxide (NO2), and heavy metals, are pollutants linked to cause brain disorder.
Carbon Monoxide (CO): exposure linked to increased risk of neurological disorders, including dementia and Parkinson's disease.
Source: Myschool Past Questions Archive (Record #27480)
Chemistry
UTME / JAMB 2012
Acids, Bases, and Salts
Which of the following will produce a solution with pH less than 7 at equivalent point?
A
HNO 3 +NaOH
B
H 2SO 4 + KOH
C
HCL +Mg (OH) 2
D
HNO 3 + KOH
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 #27481)
Chemistry
UTME / JAMB 2012
Stoichiometry & Mole Concept
Solution
The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its
A
basicity
B
acid strength
C
pH
D
concentration
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The basicity of an acid is the number of replaceable Hydrogen ions, \(H^+\), or Hydroxonium ion, \(H_{3}O^{+}\) in one molecule of the acid.
Source: Myschool Past Questions Archive (Record #27482)
Chemistry
UTME / JAMB 2012
Stoichiometry & Mole Concept
During a titration experiment, 0.05 moles of carbon (lV) oxide is liberated. What is the volume of gas liberated?
A
22.40 dm 3
B
11.20 dm 3
C
2.24 dm 3
D
1.12 dm 3
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 #27483)
Chemistry
UTME / JAMB 2012
Acids, Bases, and Salts
A major factor considered in selecting a suitable method for preparing a simple salt is its
A
Crystalline from
B
melting point
C
reactivity with dilute acids
D
solubility in water
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 #27484)
Chemistry
UTME / JAMB 2012
Electrochemistry and Redox
The oxidation number of boron in NaBH 4 is
A
-3
B
-1
C
+1
D
+3
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 #27485)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
Solution
2\(Na_2O_{2(s)} + 2H_2O_{(1)}\)→ 4\(NaOH_{(s)} +O_{2(g)}\)
The substance that is oxidized in the reaction above is
A
\(Na_2O_{2(s)}\)
B
NaOH(aq)
C
H2O(1)
D
O2(g)
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
\(Na_2O_2\) removes hydrogen from water and oxidizes it to free non-metallic oxygen.
Source: Myschool Past Questions Archive (Record #27486)
Chemistry
UTME / JAMB 2012
Stoichiometry & Mole Concept
Solution
What number of moles of Cu 2+ will be deposited by 360 coulombs of electricity?
[f = 96500 C mol -1]
A
5.36 x 10 -4 mole
B
1. 87 x 10 10 -3 mole
C
9. 35 x 10 -4 mole
D
3. 73 x 10 -3
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Cu\(^{2+}\) + 2e\(^{-}\)\(_{(aq)}\) \(\rightarrow\) Cu\(_{(s)}\)
Liberating 1 mole of Cu
2 x 1F = 2 x 96,500C = 193,000C of electricity is needed
Hence, 193,000C = 1 mole
360C of electricity = \(\frac{360C \times 1 mol}{193,000C}\)
= 0.001865 mol
= 1.87 x 10\(^{-3}\) moles
Source: Myschool Past Questions Archive (Record #27487)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
A metal M displaces zinc from ZnCl solution
This shows that
A
electrons flow from zinc to M
B
M is more electropositive than zinc
C
M is more electonegative than zinc
D
zinc is more electropositive than M
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 #27488)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
Solution
CO(g) + H\(_2\) O\(_{(g)}\) → CO\(_{2(g)}\) + H\(_{2(g)}\)
Calculate the standard heat change of the reaction above, if the standard enthalpies of formation of CO\(_{2(g)}\), H\(_2\)O\(_{(g)}\) and CO\(_{(g)}\) in kJmol\(^{-1}\) are - 394, -242 and - 110 respectively.
A
+ 262 KJ mol -1
B
- 262 KJ mol -1
C
+ 42 KJ mol -1
D
- 42 KJ mol -1
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
\(\Delta H (formation) (CO_2) = -394\)
\(\Delta H (formation) (H_2 O) = -242\)
\(\Delta H (formation) (CO) = -110\)
\(X = \sum H_{P} ^{F} - \sum H_{R} ^{F}\)
= (-394+ 0) - (-110 - 242 )
= -394 +352
= - 42 kJmol\(^{-1}\)
Source: Myschool Past Questions Archive (Record #27489)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
An increase in entropy can best be illustrated by
A
mixing of gases
B
freezing of water
C
the condensation of vapour
D
solidifying candle wax
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 #27490)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
The highest rate of production of carbon (lV) oxide can be achieved using
A
0.05 mol -3HCI and 5g powdered CaCO3
B
0.05 mol -3HCI and 5g lump CaCO3
C
0.10 mol -3HCI and 5g powdered CaCO3
D
0.025 mol -3HCI and 5g powdered CaCO3
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 #27491)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
A piece of filter paper moistened with lead (ll) ethanoate solution turns black when the paper is dropped into a gas likely to be
A
sulphur (VI) oxide
B
hydrogen chloride
C
sulphur (VI) oxide
D
hydrogen sulphide
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 #27492)
Chemistry
UTME / JAMB 2012
Acids, Bases, and Salts
Which of the following gases has a characteristic pungent smell, turns red litmus paper blue and forms dense white fumes with hydrogen chloride gas?
A
N2
B
N2O
C
CI2
D
NH3
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 #27493)
Chemistry
UTME / JAMB 2012
Matter & Separation Techniques
Commercial bleaching can be carried out using
A
sulphur (IV) oxide and ammonia
B
hydrogen sulphide and chlorine
C
chlorine and sulphur (IV) oxide
D
ammonia and chlorine
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 #27494)