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Chemistry
UTME / JAMB 2014
Atomic Structure and Periodic Table
An element X has electron configuration 1s2 2s2 2p6 3s2 3p5. Which of the following statements is correct about the element?
A
lt has a completely filled p-orbital
B
lt has 5 electrons in its outermost shell.
C
lt belongs to group ll on the periodic table
D
lt is a halogen
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 #30680)
Chemistry
UTME / JAMB 2014
Atomic Structure and Periodic Table
If the difference in electronegativity of elements P and Q is 3.0. The bond that will be formed between them is
A
metallic
B
covalent
C
co-ordinate
D
ionic
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 #30683)
Chemistry
UTME / JAMB 2014
Atomic Structure and Periodic Table
How many protons, neutrons and electrons respectively are present in the element 60/27 Co?
A
27, 33 and 33
B
33, 27 and 27
C
27, 33, and 27
D
60, 33 and 60
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 #30688)
Chemistry
UTME / JAMB 2014
Stoichiometry & Mole Concept
The radio active radiation used in studying the arrangement of particles in giant organic molecules is
A
\(\gamma\)- rays
B
\(\alpha\)- particles
C
X-rays
D
\(\beta\) - particles
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 #30689)
Chemistry
UTME / JAMB 2014
Stoichiometry & Mole Concept
Solution
A silicon -containing ore has 92% 28Si, 5% 29Si and 3% 30Si. Calculate the relative atomic mass of the silicon.
A
14.00
B
29.00
C
28.11
D
28.00
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
(\(\frac{92}{100}\) x 28) + (\(\frac{5}{100}\) x 29) + (\(\frac{3}{100}\) x 30) = 28.11
Source: Myschool Past Questions Archive (Record #30690)
Chemistry
UTME / JAMB 2014
Matter & Separation Techniques
Solution
Water is said to be temporarily hard when it contains
A
Ca (HCO3)2 and Mg (HCO3)2 salts
B
Ca (HCO3)2 and CaCO3 SALTS
C
Mg(HCO3)2 and CaSO4 salts
D
CaSO4 and Ca(HCO3)2 salts
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Temporary hardness is caused by the presence of dissolved calcium hydrogentrioxocarbonate(IV) and magnesium hydrogentrioxocarbonate(IV) which decomposes on heating to form calcium trioxocarbonate(IV) and magnesium trioxocarbonate(IV) respectively.
Source: Myschool Past Questions Archive (Record #30693)
Chemistry
UTME / JAMB 2014
Matter & Separation Techniques
On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as
A
efflorescence
B
deliquescence
C
hygroscopy
D
hydrolysis
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 #30694)
Chemistry
UTME / JAMB 2014
Stoichiometry & Mole Concept
Solution
16.55g of lead (ll) trioxonitrate (V) was dissolved in 100g of distilled water at 20oC, calculate the solubility of the solute in moldm-3
[Pb = 207, N = 14, O = 16]
A
0.05 g
B
2.00 g
C
1.00 g
D
0.50g
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
molar mass of pb (N0 3) 2 = 331
Mole = \(\frac{16.55}{331}\)= 0.05 mole
∴0.05mole pb (No3)2 dissolved in 1000g H2O x = \(\frac{0.05\times1000}{100}\)= 0.5 mole /dm 3
Source: Myschool Past Questions Archive (Record #30695)
Chemistry
UTME / JAMB 2014
Acids, Bases, and Salts
Which of the following salts will turn blue litmus red?
A
Sodium tetrahydroxozincate (ll)
B
Sodium hydrogentetraoxosulphate (VI)
C
Sodium trioxocarbonate (lV)
D
Zinc chloride hydroxide
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 #30706)
Chemistry
UTME / JAMB 2014
Electrochemistry and Redox
Zn (s) + CuSO 4(aq) → ZnSO 4(aq) + Cu (s)
In the reaction above, the oxidation number of the reducing agent changes from
A
0 to + 4
B
0 to + 2
C
+ 1 to + 2
D
+ 1 to + 3
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 #30707)
Chemistry
UTME / JAMB 2014
Matter & Separation Techniques
Solution
\(H_2O_{(g)} + C_{(s)} → H_{2(g)} + CO_{(g)}\)
The oxidizing agent in the reaction above is
A
CO(g)
B
C(s)
C
H2O(g)
D
H(2)(g)
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The oxidizing agent is \(H_2O_{(l)}\). The reason is that it loses oxygen to the reducing agent, Carbon
Source: Myschool Past Questions Archive (Record #30709)
Chemistry
UTME / JAMB 2014
Matter & Separation Techniques
Solution
Calculate the quantity of electricity in coulombs required to liberate 10g of copper from a copper compound
[Cu=64, F = 96500 Cmol-1]
A
32395.5
B
30156.3
C
60784.5
D
15196.5
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Cu\(^{2+}\) + 2e\(^-\) → Cu
If 2 x 96,500 C is required to produce 64g Cu
Then, X will be required to produce 10g Cu
X = \(\frac{{2}\times{96,500}\times{10}}{64}\)
X = 30, 156.25
X = 30,156.3 C
Source: Myschool Past Questions Archive (Record #30710)
Chemistry
UTME / JAMB 2014
Stoichiometry & Mole Concept
Solution
How many faraday of electricity is required to produce 0.25 mole of copper?
A
1.00F
B
0.01F
C
0.05F
D
0.50F
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Cu → Cu2+ + 2e
1mole Cu requires 2f
0.25 mole Cu requires x
x = 0.25x2/1 = 0.50f
Source: Myschool Past Questions Archive (Record #30711)
Chemistry
UTME / JAMB 2014
Matter & Separation Techniques
The dispersion of a liquid in a liquid medium will give
A
an emulsion
B
a fog
C
a gel
D
an aerosol
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 #30697)
Chemistry
UTME / JAMB 2014
Matter & Separation Techniques
The major and most effective way of controlling pollution is to
A
improve machinery so that the substances released from combustion are less harmful
B
pass strict laws against it by individuals and companies
C
educate people on the causes and effects of pollution
D
convert chemical wastes to harmless substances before releasing them into the environment
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 #30698)