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Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
Solution
In the extraction of iron, the waste gas from the furnace is a mixture of
A
PH3 CO and CO2
B
CO and C
C
N2 , CO and CO2
D
PH3 and CO
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
the \(N_2\) from the hot air blast to burn the coke (48%), the \(CO\) (23%) and \(CO_2\) (21%) produced from the reduction of the iron ore \(Fe_{2}O_{3}\) by carbon (the coke) are the major components of the waste from the extraction.
Source: Myschool Past Questions Archive (Record #44607)
Chemistry
UTME / JAMB 2016
Acids, Bases, and Salts
Solution
In a neutralization reaction involving HCI and NaOH using litmus as indicator, the colour at the end point is
A
Blue
B
Red
C
Orange
D
Purple
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Neutral litmus paper is purple. the result of a neutralization reaction is salt and water and hence is neutral.
Source: Myschool Past Questions Archive (Record #44608)
Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
An example of a solid emulsion is
A
Butter
B
Hair cream
C
Milk
D
Cod-liver oil
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 #44610)
Chemistry
UTME / JAMB 2016
Atomic Structure and Periodic Table
An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is
A
16
B
15
C
31
D
46
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 #44611)
Chemistry
UTME / JAMB 2016
Stoichiometry & Mole Concept
Solution
Calculate the volume in cm3 of oxygen evolved at s.t.p when a current of 5A is passed through acidified water for 193s?
[F = 96500 C mol1. Molar volume of a gas at s.t.p = 22.4dm3]
A
0.056dm3
B
0.224dm3
C
224.000dm3
D
56.000dm3
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Q = 193 x 5 = 965C
40H \(\mapsto\) 2H2O + O2 + 4e
4 x 96500C = 22.4dm3
965C = x
x = \(\frac{22.4 \times 965}{4 \times 96500}\)
= 0.056dm3
Source: Myschool Past Questions Archive (Record #44615)
Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
The gas that is used for the treatment of cancer is
A
Neon
B
Radon
C
Xenon
D
Argon
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 #44617)
Chemistry
UTME / JAMB 2016
Acids, Bases, and Salts
Solution
A chemical reaction in which the hydration energy is greater than the lattice energy is referred to as
A
A reversible reaction
B
A spontenous reaction
C
An endothermic reaction
D
An exothermic reaction
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
In salts for which the hydration energy is higher than the lattice energy, solvation occurs with a release of energy in the form of heat. A reaction in which there is a release of energy as LIGHT OR HEAT is EXOTHERMIC.
Source: Myschool Past Questions Archive (Record #44620)
Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
MnO\(_4\)(aq) + Y + 5Fe\(^{2+}\) (aq) \(\mapsto\) Mn\(^{2+}\) (aq) + 5Fe\(^{3+}\) (aq) + 4H\(_2\)O (l).
In the equation above, Y is
A
10H+ (aq)
B
5H+ (aq)
C
8H+ (aq)
D
4H+ (aq)
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 #44624)
Chemistry
UTME / JAMB 2016
Atomic Structure and Periodic Table
Diagram
Solution
The compound above exhibits
Attached Figure / Diagram
A
Geometric isomerism
B
Positional isomerism
C
Structural isomerism
D
Optical isomerism
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Optical isomers are molecules that are non-superimposable mirror images of each other and they are not identical. Molecules with a chiral carbon show this kind of isomerism. Chiral carbon, also known as asymmetric carbon, refers to carbon atom that are bonded to four different atoms or groups of atoms.
Source: Myschool Past Questions Archive (Record #44627)
Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
n monosaccharide \( \underset{Q}{\stackrel{P}{\rightleftharpoons}} \) polysaccharide -n water.
In the process above, P and Q respectively represent
A
Condensation and hydrolysis
B
Fermentation and condensation
C
Polymerization and hydrolysis
D
Polymerization and condensation
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 #44632)
Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
CH4(g) + CI2(g) \(\to\) CH2CI(s) + HCIg
The major factor that influences the rate of the reaction above is
A
Concentration
B
Catalyst
C
Temperature
D
Light
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 #44645)
Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
N2O4(aq) \(\rightleftharpoons\) 2NO2(g) \(\bigtriangleup\)H = +ve
In the reaction above, an increase in temperature will
A
Increase the reactant production
B
Increase the value of the equilibrium constant
C
Shift the equilibrium to the left
D
Decrease the value of the equilibrium constant
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 #44655)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
The following atoms of carbon 126C, 136C and 146C can be described as?
A
Allotropes
B
Isomers
C
Isotopes
D
Isotones
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 #45081)
Chemistry
WAEC / WASSCE 2016
Atomic Structure and Periodic Table
An atom X consist of 6 protons, 6 electrons and 7 neutrons. Which of the following representations of the atom is correct?
A
136X
B
137X
C
196X
D
197X
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 #45082)
Chemistry
WAEC / WASSCE 2016
Atomic Structure and Periodic Table
Solution
How many electrons are present in \(^9_4Be^{2+}\)?
A
2
B
4
C
5
D
6
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Neutral Be has 4 electrons but \(Be^{2+}\) means it has lost two electrons from possible four and became a positive ion.
\(\therefore\) the number of electrons left will be equal to two.
Source: Myschool Past Questions Archive (Record #45083)