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Chemistry WAEC / WASSCE 2010 Matter & Separation Techniques
Which of the following elements is a d-block element?
A
Calcium
B
lron
C
Lithium
D
Silicon
medium Difficulty
Chemistry WAEC / WASSCE 2010 Matter & Separation Techniques
Which of the following statements about chlorine and iodine at room temperature is correct?
A
Chlorine is gas and iodine is solid
B
Chlorine is liquid and iodine is gas
C
Chlorine and iodine are gases
D
Chlorine is solid and iodine is liquid
medium Difficulty
Chemistry WAEC / WASSCE 2010 Matter & Separation Techniques
If X is a group lll element, its oxide would be represented as
A
X3O2
B
X3O
C
X2O3
D
XO3
medium Difficulty
Chemistry WAEC / WASSCE 2010 Atomic Structure and Periodic Table
Which of the following species correctly represented an ion of M with 13 protons and 10 electrons?
A
10M 3+
B
10M 3-
C
13M 3+
D
13M 3-
medium Difficulty
Chemistry WAEC / WASSCE 2010 Matter & Separation Techniques
A solid substance with high melting and boiling points is likely to be a/an
A
covalent compound
B
dative covalent compound
C
electrovalent compound
D
non-metal
medium Difficulty
Chemistry WAEC / WASSCE 2010 Stoichiometry & Mole Concept
Which of the following molecules has a linear shape?
A
CH4
B
CO 2
C
H2S
D
NH 3
medium Difficulty
Chemistry WAEC / WASSCE 2010 Atomic Structure and Periodic Table
Which of the following molecules has a triple bond in its structure?
A
CH4
B
NH3
C
N2
D
O 2
medium Difficulty
Chemistry WAEC / WASSCE 2010 Stoichiometry & Mole Concept
Consider the neutralization reaction represented by the following equation: Na2CO3 + 2HNO 3 → 2NaNO3 + H2O + CO2 The stoichiometric ratio of acid to base is
A
2:2
B
2:1
C
1:2
D
1:1
medium Difficulty
Chemistry WAEC / WASSCE 2010 Matter & Separation Techniques
A solution of sodium trioxocarbonate (IV) contains 10.6g in 250cm3 of solution. Calculate the concentration of the solution. [Na2CO3 = 106.0]
A
0.4 mol dm-3
B
1.0 mol dm-3
C
10.6 mol dm-3
D
25.0 mol dm-3
medium Difficulty
Chemistry WAEC / WASSCE 2010 Stoichiometry & Mole Concept
What is the volume occupied by 2 moles of ammonia at s.t.p?
A
44.8 dm-3
B
22.4 dm-3
C
11.2 dm-3
D
5.6 dm-3
medium Difficulty
Chemistry WAEC / WASSCE 2010 Matter & Separation Techniques
Which of the following apparatus can be used to measure accurately a specific volume of a liquid?
A
Beaker
B
Conical flask
C
Measuring cylinder
D
Pipette
medium Difficulty
Chemistry WAEC / WASSCE 2010 Matter & Separation Techniques
A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon (IV) oxide to diffuse under the same condition? [C = 12.0, O = 16.0]
A
5.8 seconds
B
6.8 seconds
C
9.4 seconds
D
11.0 seconds
medium Difficulty
Chemistry WAEC / WASSCE 2010 Stoichiometry & Mole Concept
Which of the following gases contains the highest number of atoms at s.t.p?
A
6 moles of neon
B
3 moles of oxygen
C
2 moles of chlorine
D
1 mole of ethane
medium Difficulty
Chemistry WAEC / WASSCE 2010 Matter & Separation Techniques
The determination of heat of combustion is carried out with
A
a thermometer
B
a bomb calorimeter
C
an evaporating dish
D
a boiling tube
medium Difficulty
Chemistry WAEC / WASSCE 2010 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
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