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Chemistry
WAEC / WASSCE 2016
Atomic Structure and Periodic Table
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
Matter & Separation Techniques
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
Matter & Separation Techniques
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
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
Matter & Separation Techniques
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
Matter & Separation Techniques
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
Matter & Separation Techniques
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
Atomic Structure and Periodic Table
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)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
Which of the following elements would produce coloured ion in agueous solution?
A
Calcuim
B
Copper
C
Magnesuim
D
Sodium
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 #45093)
Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
Diagram
The functional groups present in the compound above are
Attached Figure / Diagram
A
Alkene and halo-group
B
Hydroxyl and chloro-group
C
Alkene and chloro-group
D
Hydroxyl and halo-group
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 #44640)
Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
Diagram
In the diagram above, X is the
Attached Figure / Diagram
A
Enthalphy
B
Activated complex
C
Activation energy
D
Enthalphy change
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 #44641)
Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
Diagram
The diagram represents
Attached Figure / Diagram
A
A spontaneous reaction
B
An exothermic reaction
C
A non-spontaneous
D
An endothermic reaction
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 #44642)
Chemistry
UTME / JAMB 2016
Stoichiometry & Mole Concept
Diagram
The curve depicts titration between a strong acid of pH
Attached Figure / Diagram
A
Strong acid and strong base
B
Strong acid and weak base
C
Weak acid and weak base
D
Weak acid and strong base
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 #44643)
Chemistry
UTME / JAMB 2016
Matter & Separation Techniques
Diagram
Solution
From the diagram above, an ideal gas can be represented by
Attached Figure / Diagram
A
K
B
M
C
L
D
N
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
see diagram in textbook
Source: Myschool Past Questions Archive (Record #44644)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
The minimum amount of energy required for effective collisions between reacting particles is known as
A
Activation energy
B
Bond energy
C
Kinetic energy
D
Potential energy
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 #45094)