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Chemistry
UTME / JAMB 2016
Organic Chemistry I: Hydrocarbons & Crude Oil
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
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
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
Stoichiometry, Mole Concept & Volumetric Analysis
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
Reaction Rates & Chemical Equilibrium
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
Atomic Structure, Orbitals & Nuclear Chemistry
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, Orbitals & Nuclear Chemistry
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
Stoichiometry, Mole Concept & Volumetric Analysis
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)
Chemistry
WAEC / WASSCE 2016
Chemical Bonding & Intermolecular Forces
Solution
When element \(_{20}\)Y combines with element \(_8\)Z, it forms
A
A covalent compound , YZ is formed
B
A covalent compound, ZY is formed
C
An ionic compound, YZ is formed
D
An ionic compound, ZY is formed
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Y = 2,8,8,2 and Z = 2,6.
Y will readily give off its 2 valence electrons and Z will accept the 2 electrons in order to achieve octet configuration. Hence, the compound YZ is formed by ionic bonding.
Source: Myschool Past Questions Archive (Record #45084)
Chemistry
WAEC / WASSCE 2016
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The boiling points of HF, H2O and NH3 increase in the order of
A
NH3
B
H2O < HF
C
HF 3 2O
D
NH3 2O
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Ammonia = -33.34^\circC; Hydrogen fluoride = 19.5^\circC; Water = 100^\circC
Source: Myschool Past Questions Archive (Record #45085)
Chemistry
WAEC / WASSCE 2016
Stoichiometry, Mole Concept & Volumetric Analysis
Chemicals that are produced in small quantities and with very degree of purity are
A
Bulk chemicals
B
Fine chemicals
C
Heavy chemicals
D
Light chemicals
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 #45086)
Chemistry
WAEC / WASSCE 2016
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The mass of potassium hydroxide required to make 300.ocm3 of 0.4 moldm-3 solution is {KOH = 56.0}
A
26.88g
B
13.44g
C
6.72g
D
3.36g
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
300cm3 of 0.4moldm3
1000cm3 contains 0.4mole
300cm3 will contain \(\frac{300 \times 0.4}{1000}\)
= 0.12mole
Number of moles = \(\frac{Mass}{\text {Molecular mass}}\)
Mass = number of moles x m.mass
= 0.12 x 56 = 6.72g
Source: Myschool Past Questions Archive (Record #45087)
Chemistry
WAEC / WASSCE 2016
Stoichiometry, Mole Concept & Volumetric Analysis
Metals can be stretched into wires because they are
A
Ductile
B
Good conductors
C
Lustrous
D
Malleable
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 #45088)
Chemistry
WAEC / WASSCE 2016
Stoichiometry, Mole Concept & Volumetric Analysis
Aluminium is used in the manufacture or aircraft because it
A
Is hard and brittle
B
Is light and resists corrosion
C
Has high density and conducts electricity
D
Is malleable and ductile
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 #45089)
Chemistry
WAEC / WASSCE 2016
Water, Solutions & Solubility
Solution
An unsaturated solution differs from a saturated solution at a given temperature because it
A
Cannot dissolve more solute
B
Can hold more solute than it can actually dissolve
C
Can still dissolve more solute at given temperature
D
Form crystal more easily on cooling
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
An unsaturated solution contains a lesser amount of solute than that in a saturated solution. It can go on to dissolve more quantities of solute at the same temperature until it becomes a saturated solution.
Source: Myschool Past Questions Archive (Record #45090)
Chemistry
WAEC / WASSCE 2016
Chemical Bonding & Intermolecular Forces
Solution
The shape of the water molecule is_______?
A
Linear
B
Pyramidal
C
Tetrahedral
D
V-shaped
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
The bond angle in water is compressed approximately to 105^\circ, such that the structure of the water molecule is V-shaped or Angular.
Source: Myschool Past Questions Archive (Record #45092)