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Chemistry WAEC / WASSCE 2014 Matter & Separation Techniques
Which of the following processes is used in food preservation in an industry?
A
Carbon dating
B
Ieeadiation of gamma rays
C
Nuclear fission
D
Nuclear fusion
medium Difficulty
Chemistry WAEC / WASSCE 2014 Atomic Structure and Periodic Table
The relative atomic mass of chlorine is not a whole number because
A
it is the weighted average mass of all its various isotopes
B
it is the average mass of all the isotopes of the element
C
the element has strong oxidizing ability
D
the atom contains a higher number of neutrons than protons
medium Difficulty
Chemistry WAEC / WASSCE 2014 Matter & Separation Techniques
NH4- is formed from NH3 and H- by
A
covalent bonding
B
dative bonding
C
hydrogen bonding
D
ionic bonding
medium Difficulty
Chemistry WAEC / WASSCE 2014 Atomic Structure and Periodic Table
How many lone pair (s) of electrons is present in HF?
A
o
B
1
C
2
D
3
medium Difficulty
Chemistry WAEC / WASSCE 2014 Matter & Separation Techniques
An aqueous solution of Na2CO3 is
A
acidic
B
alkaline
C
amphoteric
D
neutral
medium Difficulty
Chemistry WAEC / WASSCE 2014 Matter & Separation Techniques
A gaseous mixture contains 0,256 g of hydrogen and 2.00 g of oxygen. The mole ration of hydrogen to oxygen in the mixture is (H=1.00; O=16,0)
A
1:1
B
2:1
C
1:4
D
8:1
medium Difficulty
Chemistry WAEC / WASSCE 2014 Acids, Bases, and Salts
The oxidation number of sulphur in Fe2(SO4)3 is
A
+2.
B
+3
C
+4.
D
+6.
medium Difficulty
Chemistry WAEC / WASSCE 2014 Stoichiometry & Mole Concept
If 0.20 mol dm-3 NaOH(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH (aq) used. (Na = 23.0,O = 16:0; H = 1.00)
A
600cm-3
B
625cm3
C
10003
D
1600 cm 3
medium Difficulty
Chemistry WAEC / WASSCE 2014 Stoichiometry & Mole Concept
The mass of 800cm3 of gas Q at s.t.p. is 1.0g. What is the molar mass of Q? [Avogadros constant = 22.4dm3 mol-1`]
A
18.0 gmol-1
B
22,4gmol-1
C
28.0gmol-1
D
36.0 gmol-1
medium Difficulty
Chemistry WAEC / WASSCE 2014 Kinetics, Energetics and Equilibrium
Which of the following statements about a chemical system in equilibrium is correct/ The
A
reaction is irreversible
B
reaction goes to completion
C
equilibrium is re-established when a stress is applied
D
equilibrium position is affected by catalyst
medium Difficulty
Chemistry WAEC / WASSCE 2014 Matter & Separation Techniques
Which of the following relationships correctly expresses the Boyle's law?
A
P \(\alpha\) V at constant T
B
V \(\alpha\) T at constant P
C
P \(\alpha\) \(\frac{1}{V}\) at constant T
D
V \(\alpha\) \(\frac{1}{T}\) at constant P
medium Difficulty
Chemistry WAEC / WASSCE 2014 Matter & Separation Techniques
The vapour pressure of a given volume of liquid increase when the
A
liquid becomes saturated with a salt
B
Volume of the liquid increases
C
temperature of the liquid falls
D
temperature of the Liquid rises
medium Difficulty
Chemistry WAEC / WASSCE 2014 Matter & Separation Techniques
Which of the following statements about volatile liquids is correct? They have
A
high vapour pressure and low boiling point
B
high vapour pressure and high boling point
C
low vapour pressure and low boining point
D
low vapour pressure and high boiling point
medium Difficulty
Chemistry WAEC / WASSCE 2014 Acids, Bases, and Salts
The type of energy changes that accompany the mixing of a strong acid to a strong base is
A
electrical
B
heat
C
light
D
sound
medium Difficulty
Chemistry WAEC / WASSCE 2014 Acids, Bases, and Salts
Zinc oxide is said to be amphoteric because it
A
forms an acid salt
B
is an insoluble base
C
forms a double salt
D
reacts with a base or an acid
medium Difficulty
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