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Chemistry WAEC / WASSCE 2009 Matter & Separation Techniques
What is the value of -14oC on the Kelvin temperature scale?
A
259K
B
287 K
C
287oK
D
259oK
medium Difficulty
Chemistry WAEC / WASSCE 2009 Matter & Separation Techniques
Which of the following expressions correctly represents Charles' law?
A
PV = K
B
R \(\alpha \frac{1}{\sqrt{p}\)
C
PV = RT
D
V = KT
medium Difficulty
Chemistry WAEC / WASSCE 2009 Matter & Separation Techniques
In a mixture of gases which do not react chemically together, the pressure exerted by the individual gases is called
A
atmospheric pressure
B
partial pressure
C
total pressure
D
vapour pressure
medium Difficulty
Chemistry WAEC / WASSCE 2009 Matter & Separation Techniques
In a chemical reaction, ∆H is positive when
A
H (product) >H (reactant)
B
H(product) (reactant)
C
H (product) = H (reactant)
D
H (product) = Zero (reactant)
medium Difficulty
Chemistry WAEC / WASSCE 2009 Kinetics, Energetics and Equilibrium
Consider the reaction represented by the following equation: H 2(g) + \(\frac{1}{2}\) O(g) → H 2O(g) ∆H =-285.8 KJmo -1 ∆H represents the enthalpy of
A
formation
B
hydration
C
neutralization
D
solution
medium Difficulty
Chemistry WAEC / WASSCE 2009 Matter & Separation Techniques
A solution that contains as much solute as it can dissolve at a given temperature is said to be
A
concentrated
B
saturated
C
supersaturated
D
unsaturated
medium Difficulty
Chemistry WAEC / WASSCE 2009 Acids, Bases, and Salts
Which of the following salts is insoluble in water?
A
Pb (NO3)2
B
Na 2CO3
C
AgNO3
D
AgCI.
medium Difficulty
Chemistry WAEC / WASSCE 2009 Matter & Separation Techniques
Which of the following statement is correct? The solubility of
A
gases increases with increase in temperature
B
gases decreases with increase in temperature
C
most solid solutes decreases with indease in temperature
D
most solid solutes is constant
medium Difficulty
Chemistry WAEC / WASSCE 2009 Kinetics, Energetics and Equilibrium
A catalyst increases the rate of chemical reaction by
A
decreasing the temperature of the reaction
B
decreasing the activation energy of the reaction
C
increasing the surface area of the reactants
D
decreasing the surface area of the products
medium Difficulty
Chemistry WAEC / WASSCE 2009 Matter & Separation Techniques
Which of the following factors will affect the rate of the reaction represented by the equation? 2HCI(aq) + CaCO 3(s) → CaCI2(aq) + H2O (I) + CO2(g) l. Pressure ll. Concentration III. Nature of reactants IV. Temperature
A
l and ll only
B
ll, lll and IV only
C
l, ll and lll only
D
l, ll, lll and IV
medium Difficulty
Chemistry WAEC / WASSCE 2009 Electrochemistry and Redox
Which of the following substances is the anode in the dry Leclanche cell ?
A
Carbon rod
B
Muslin bag
C
The seal
D
Zinc container
medium Difficulty
Chemistry WAEC / WASSCE 2009 Matter & Separation Techniques
Consider the reaction represented by the equation: 2H2SO 4(aq0 + C(s) → 2H2O(l) + 2SO2(g) + CO 2(g) H2SO 4 is acting as
A
a catalyst
B
an oxidizing agent
C
a reducing agent
D
a sulphonating agent
medium Difficulty
Chemistry WAEC / WASSCE 2009 Electrochemistry and Redox
Which of the following oxides of nitrogen has oxidation number of + 1?
A
KNO3
B
N2O
C
N2O3
D
NO
medium Difficulty
Chemistry WAEC / WASSCE 2009 Matter & Separation Techniques
The separation of petroleum fractions depends on the differences in their
A
boiling points
B
molar masses
C
melting point
D
solubilities
medium Difficulty
Chemistry WAEC / WASSCE 2009 Matter & Separation Techniques
Which of the following raw materials is used in the plastic industry ?
A
Calcium
B
Ethene
C
Hydrogen
D
Methane
medium Difficulty
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