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Chemistry
WAEC / WASSCE 2016
Atomic Structure and Periodic Table
The bond formed between H2O and H+ to form the hydroxonium H3O+ is
A
Dative
B
Covalent
C
Electrovalent
D
Ionic
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 #45095)
Chemistry
WAEC / WASSCE 2016
Acids, Bases, and Salts
An element X froms the following oxides X2O, XO and XO2. This phenomenon illustrates the law of________?
A
Conservation of mass
B
Definite proportion
C
Mass action
D
Multiple proportion
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 #45096)
Chemistry
WAEC / WASSCE 2016
Stoichiometry & Mole Concept
Solution
How many moles of oxygen would contain 1.204 x 1024 molecules?
[Avogadro's constant (NA) = 6.02 x 1023]
A
1
B
2
C
3
D
4
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
6.02 x 1023 molecules is 1mole
1.204 x 1024 molecules will be......
\(\frac{1.204 \times 10^24 \times 1}{6.02 \times 10^23}\)
\(\frac{1.204 \times 10}{6.02}\) = \(\frac{12.04}{6.02}\) = 2moles
Source: Myschool Past Questions Archive (Record #45097)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
Which of the following statements about solids is correct?
A
Solid particles are less orderly than those of a liquid
B
Solid have lower densities than liquids
C
Solid particles have greater kinetic energies than those of liquids
D
Solid particles cannot be easily compressed
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 #45098)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
Solution
Which of the following apparatus can be used to measure a specific volume of a liquid accurately?
A
Beaker
B
Conical flask
C
Measuring cyclinder
D
Pipette
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
A pipette is generally more accurate than a measuring cylinder for measuring specific volumes of liquid. Pipettes are designed for precise transfer and measurement of specific volumes, while measuring cylinders are less precise due to their larger meniscus and less accurate calibration.
Source: Myschool Past Questions Archive (Record #45099)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
The general gas equation \(\frac{PV}{T}\) = K is a combination of
A
Boyle's and Charles' laws
B
Boyle's and Graham's laws
C
Charles' and Graham's laws
D
Dalton's and Graham's laws
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 #45100)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
The spreading of the scent of a flower in a garden is an example of_____?
A
Brownian motion
B
Diffusion
C
Osmosis
D
Tynadal effect
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 #45103)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
Propane carbon(IV)oxide diffuse at the same rate because [H = 1.00, C = 12.0, O = 16.0]
A
They are both gases
B
Their molecules contain carbon
C
They have the same relative molecular mass
D
Both are denser than air
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 #45147)
Chemistry
WAEC / WASSCE 2016
Atomic Structure and Periodic Table
The energy which accompanies the addition of an electron to an isolated gaseous atom is
A
Atomization
B
Electronegativity
C
Electron affinity
D
Ionization
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 #45185)
Chemistry
WAEC / WASSCE 2016
Acids, Bases, and Salts
Solution
An aqueous solution of (NH4)2 SO4 is
A
Acidic
B
Alkaline
C
Amphoteric
D
Neutral
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Ammonium sulphate is an ACIDIC SALT. This is because it is formed when sulphuric acid reacts with ammonia. Since, sulphuric acid is a strong acid and ammonia is a weak base, so it gets acidic in nature.
Source: Myschool Past Questions Archive (Record #45188)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
When NH4Cl(s) is dissolved in water, the container feels cold to touch. This implies
A
The process is endothermic
B
The process is exothermic
C
NH4Cl forms a saturated solution
D
NH4Cl is highly soluble in water
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 #45190)
Chemistry
WAEC / WASSCE 2016
Acids, Bases, and Salts
The pH of four solutions M,N,Q and R are 2,6,8 and 11 respectively.
Which of the following deductions about the solutions is correct?
A
The pH of N is increased when the solution is diluted
B
The pH of Q is increased when the solution is evaporated
C
M is the most alkaline solution
D
R is the most acidic solution
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 #45192)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
Consider the following reaction equation
H3O+(aq) + OH(aq) \(\rightarrow\) 2H2O(1)
The reaction represents
A
Esterification
B
Hydrolysis
C
Neutralization
D
Redox
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 #45195)
Chemistry
WAEC / WASSCE 2016
Matter & Separation Techniques
The refreshing characteristic taste of fizzy drinks is due ot the presence of
A
Carbon(IV)oxide
B
Glucose
C
Hydrogen
D
Sodium Citrate
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 #45196)
Chemistry
WAEC / WASSCE 2016
Kinetics, Energetics and Equilibrium
Chemical equilibrium is attained when
A
All the reactants have been completely used up
B
The reaction goes to completion
C
The concentration of reactants and products remain constant
D
The concentration of reactants and products are equal
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 #45201)