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Chemistry
UTME / JAMB 2015
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Hydrogen can be displaced from a hot alkaline solution by
A
Fe
B
Cu
C
Ca
D
Sn
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Tin dissolves in concentrated solution of alkalis to give trioxostannate(IV) salt and hydrogen.
Source: Myschool Past Questions Archive (Record #40932)
Chemistry
UTME / JAMB 2015
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
A suitable reagent for distinguish between ethanoic and ethanol is
A
bromine water
B
Fehling’s solution
C
sodium hydrogen trioxocarbonate (iv)
D
Ammoniacal silver trioxonitrate(V)
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Sodium hydrogen trionocarbonate iv is the only distinguishing reagent between ethanoic and ethanol. Option A, B, D are not conspicuous in distinguishing between ethanoic and ethanol
Source: Myschool Past Questions Archive (Record #40913)
Chemistry
UTME / JAMB 2015
Atomic Structure, Orbitals & Nuclear Chemistry
Diagram
Solution
The above orbital diagram shown the electronic configuration of
Attached Figure / Diagram
A
chlorine
B
nitrogen
C
calcium
D
neon
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Nitrogen has an electronic configuration of 7 i.e
1s2 2ps2 2p3. option A,C,D are chlorine 17, calcium 20, neon 10
Source: Myschool Past Questions Archive (Record #40915)
Chemistry
UTME / JAMB 2015
Metals, Transition Elements & Extraction
Solution
Which of the following metals burns with brick red
A
Pb
B
Ca
C
Na
D
Mg
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Calcium is the only metal that burn with brick red flame. Option A,C,D will not burn with brick red flame rather burn with brick blue flame
Source: Myschool Past Questions Archive (Record #40916)
Chemistry
UTME / JAMB 2015
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
In the production of soap, concentrated sodium chloride solution is added to
A
increase the solubility of soap
B
decrease the solubility of the soap
C
saponify the soap
D
emulsify the soap
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Concentrated sodium chloride solution will the solubility of soap along the course of soap production. Options A,C,D are not appropriate
Source: Myschool Past Questions Archive (Record #40917)
Chemistry
UTME / JAMB 2015
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
A liquid that will dissolve fat is
A
hydrochloric acid
B
calcium hydrochloride
C
kerosene
D
water
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Kerosene is only liquid that will dissolve fat. Option A,B,D will not dissolve fat because of their chemical composition
Source: Myschool Past Questions Archive (Record #40918)
Chemistry
UTME / JAMB 2015
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
Which of the following types of alkanols undergo oxidation to produce alkanoic acids.
I. Primary alkanols
II. Secondary alkanols
III. Tertiary alkanols
A
I, II and III
B
I and II only
C
III only
D
I only
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Only primary alkanols undergo oxidation to produce alkanoic acid. Option A,B,C will not produce alkanoic acid
Source: Myschool Past Questions Archive (Record #40934)
Chemistry
UTME / JAMB 2015
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
Rare gases are stable because they
A
are monoatomic
B
form ions easily
C
have duplet or octet electronic configuration in the outermost shells in their atoms
D
are volatile gases
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Rare gases are stable because they have duplet or octet electronic configurations in the outermost shells in their atoms, as a result they don’t go into solution easily. option A, B, Dare not because they go into solution easily (unstable)
Source: Myschool Past Questions Archive (Record #40938)
Chemistry
UTME / JAMB 2015
Air & Environmental Chemistry
A major source of oxide of nitrogen is from the burning of
A
coal
B
wood
C
fuel
D
chlorofluorocarbons
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 #40939)
Chemistry
UTME / JAMB 2015
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
Which of these radioactive elements is commonly used as a nuclear fuel
A
uranium
B
palladium
C
actium
D
thorium
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Uranium is common nuclear because of its less stability as a result has a great tendency to increase energy than. Options B,C,D which are not stable
Source: Myschool Past Questions Archive (Record #40942)
Chemistry
UTME / JAMB 2015
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
All these are electromagnetic waves except
A
White light
B
Photon
C
X-ray
D
Infrared
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Photon is unit of energy that carries light and has zero mass A, C and D are all electromagnetic waves of higher mass
Source: Myschool Past Questions Archive (Record #40947)
Chemistry
UTME / JAMB 2015
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, Find the molecular formula [H = 1, C = 12, O = 16)
A
CH2O
B
C3H6O3
C
C6H12O6
D
C6H12O3
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
C = 40%, 40/12 = 3.33
H = 6.7%, 6.7/1 = 6.7
O = 53.3%, 53.3/16 = 3.33
C = 3.33/3.33 = 1
H = 6.7/3.33 = 2
O = 3.33/3.33 = 1
(CH2O)n = 180
(12 + 2 + 16)n = 180
30n = 180
n = 6
= C6H12O6
Source: Myschool Past Questions Archive (Record #40965)
Chemistry
UTME / JAMB 2015
Oxidation, Reduction & Redox Reactions
Solution
An oxidation state of Cr in K2Cr2O7
A
7
B
6
C
5
D
4
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The oxidation state of K2Cr2O7 is +6. option A,C,D are the oxidation state of other elements like O7,C14, etc.
\(+2 + 2x + (-2\times7) =0\)
\(2x=12\)
\(x = +6\)
Source: Myschool Past Questions Archive (Record #40969)
Chemistry
UTME / JAMB 2015
Periodic Table & Periodicity
Solution
The elements that belong to the third period of periodic table are
A
Li, Be, Al and D
B
Na, P, O and Cl
C
B, C, N, and O
D
Na, Mg, S and Ar
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Na, Mg, S and Ar is the set of elements that belong to third period of the periodic table. Option A,B,C have elements which belong to the other period in the periodic table included in them.
Source: Myschool Past Questions Archive (Record #40971)
Chemistry
UTME / JAMB 2015
Chemical Energetics & Thermochemistry
Solution
NH3(g) + HCl(s) → NH 4Cl (s)
The entropy change in the system above is
A
positive
B
zero
C
negative
D
intermediate
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Entropy s is a measure of the degree of disorder or randomness of a substance. The entropy charge in the system is negative. Options B, C, D will not give negative but the result into positive
Source: Myschool Past Questions Archive (Record #40975)