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Chemistry WAEC / WASSCE 2021 Stoichiometry, Mole Concept & Volumetric Analysis
Under which conditions of pressure (p) and temperature (T) would the volume of an inflated ballon increase? When
A
P and T are increased
B
both T and P are decreased
C
T is increased and P is decreased
D
T is decreased and P is increased
medium Difficulty
Chemistry WAEC / WASSCE 2021 Kinetic Theory of Matter & Gas Laws
The collision between ideal gas molecules are considered to be perfectly elastic because
A
they collide without losing energy
B
they move randomly in a straight line
C
their average kinetic energy is variable
D
the distance between them is large compared to their size
medium Difficulty
Chemistry WAEC / WASSCE 2021 Periodic Table & Periodicity
Elements with high ionization energies would-------
A
lose electrons easily
B
have large atomic radii
C
have high effective nuclear charges
D
have low atomic numbers
medium Difficulty
Chemistry WAEC / WASSCE 2021 Periodic Table & Periodicity
Which of the following statements about Group VII elements is correct?
A
they are present in the same physical state
B
they are strong reducing agents
C
their reactivity decreases down the group
D
they exist as monoatomic molecules
medium Difficulty
Chemistry WAEC / WASSCE 2021 Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following cell notations represent the diagram?
Attached Figure / Diagram
Question diagram
A
B\(^{2+}\)/B/ /A/A\(^{3+}\)
B
A\(^{3+}\) /A/ /B/B\(^{2+}\)
C
B/B\(^{2+}\)/ /A/\(^{3+}\)
D
A/A\(^{3+}\)/ /B\(^{2+}\)/B
medium Difficulty
Chemistry WAEC / WASSCE 2021 Oxidation, Reduction & Redox Reactions
Which of the following half reaction equations represent the reaction at the cathode
A
A\(^{3+_{(aq)}}\)+3e\(^{-}\) \(\rightarrow\) A\(_{(s)}\)
B
B\(^{2+_{(aq)}}\)+2e\(^{-}\) \(\rightarrow\) B\(_{(s)}\)
C
A\(_{(s)}\) \(\rightarrow\) \(^{3+_{(aq)}}\)+3e\(^{-}\)
D
B\(_{(s)}\) \(\rightarrow\) B\(^{2+_{(aq)}}\) + 2e\(^{-}\)
medium Difficulty
Chemistry WAEC / WASSCE 2021 Atomic Structure, Orbitals & Nuclear Chemistry
The reactivity of fluorine is high because of
A
its high electronegativity
B
the small size of the fluorine atom
C
the availability of d-orbitals
D
the strong F-F bond
medium Difficulty
Chemistry WAEC / WASSCE 2021 Electrolysis & Electrochemical Cells
How many coulombs of electricity would liberate 1.08g of Ag from a solution of silver salt? [Ag = 108.0; 1F = 96500 C]
A
96500 C
B
9650 C
C
965 C
D
9.65 C
medium Difficulty
Chemistry WAEC / WASSCE 2021 Periodic Table & Periodicity
Which of the following statements is correct about ionization energy? It
A
decreases across the periods
B
results in the formation of an anion
C
causes Metalic nuclei to disintegrate
D
decreases down the group
medium Difficulty
Chemistry WAEC / WASSCE 2021 Nature of Matter & Separation Techniques
Potassium trioxonitrate (V) can be obtained from its solution by----------
A
distillation
B
evapoartion
C
crystallization
D
filtration
medium Difficulty
Chemistry WAEC / WASSCE 2021 Particulate Nature of Matter, Laws & Formulae
An element, Q, contains 69% of\(^{63}\)Q and 31% of \(^{65}\)Q. What is the relative atomic mass of Q?
A
63.0
B
63.6
C
65.0
D
69.0
medium Difficulty
Chemistry WAEC / WASSCE 2021 Atomic Structure, Orbitals & Nuclear Chemistry
The following ions have the same electron configuration except \(_{8}\)O, \(_{12}\)Mg, \(_{13}\)AI, \(_{17}\)CI
A
CI\(^{-}\)
B
O\(^{2-}\)
C
Mg\(^{2+}\)
D
AI\(^{3+}\)
medium Difficulty
Chemistry WAEC / WASSCE 2021 Stoichiometry, Mole Concept & Volumetric Analysis
The region around the nucleus where electrons can be located is called?
A
a spectra
B
an orbital
C
a quanta
D
a field
medium Difficulty
Chemistry WAEC / WASSCE 2021 Atomic Structure, Orbitals & Nuclear Chemistry
The isotopes of neon are represented by the symbols \(^{20}\)\(_{x}\) Ne, \(^{21}\) \(_{y}\) Ne, and \(^{22}\) \(_{z}\) Ne. The relationship between x, y, and z is?
A
x > y > z
B
x < y < z
C
x = y= z
D
x < z < y
medium Difficulty
Chemistry WAEC / WASSCE 2021 Oxidation, Reduction & Redox Reactions
Which of the following statements about elements in Group VII is correct?
A
B\(r_2\) will oxidize CI\(^{-}\)
B
\(F_2\) has the least tendency to be reduced
C
C\(l_2\) will oxidize I\(^{-}\)
D
\(l_2\) is a stronger oxidizing agent than \(F_2\)
medium Difficulty
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