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Chemistry
NECO SSCE 2008
Matter & Separation Techniques
Which of the following is a component of the car exhaust?
A
Aluminium
B
Calcium
C
Iron
D
Zinc
E
Lead
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #43538)
Chemistry
NECO SSCE 2008
Stoichiometry & Mole Concept
The molecular formula of ethylbutanoate is?
A
CH5COOC26
B
C3HCOOC2H7
C
C3H7COOC3H7
D
C3H7COOC4H9
E
C3H7COOC2H5
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #43539)
Chemistry
NECO SSCE 2008
Matter & Separation Techniques
The rate of a chemical reaction is NOT affected by one of these factors
A
colour
B
concentration
C
presence of light
D
surface area
E
temperature
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 #43540)
Chemistry
NECO SSCE 2008
Matter & Separation Techniques
Pipe-borne water is usually chlorinated in order to
A
coagulate sediments in the water
B
improve taste of the water
C
kill harmful bacteria in the water
D
make it pure
E
remove the hardness in the water
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 #43541)
Chemistry
NECO SSCE 2008
Matter & Separation Techniques
Solution
The planet with the highest number of moon is
A
Earth
B
Jupiter
C
Uranus
D
Pluto
E
Venus.
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The planet with the most moons in the Solar System is Jupiter, with a total of 63 confirmed moons (as of 2009).
Source: Myschool Past Questions Archive (Record #43542)
Chemistry
NECO SSCE 2008
Atomic Structure and Periodic Table
Solution
If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is that with the
A
greater stability in solution
B
lower electrical charge
C
smaller mass
D
stronger tendency to accept electrons
E
stronger tendency to lose electrons.
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
In an electrolytic cell, when two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is the one that has the stronger tendency to accept electrons and become a neutral atom.
Source: Myschool Past Questions Archive (Record #43543)
Chemistry
NECO SSCE 2008
Matter & Separation Techniques
A device used in the laboratory for intermittent production of gases without heating is
A
aspirator
B
delivery tube
C
fume cupboard
D
kipp’s apparatus
E
muller counter
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 #43545)
Chemistry
NECO SSCE 2008
Atomic Structure and Periodic Table
Solution
What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?
A
Covalent
B
Dative
C
Hydrogen
D
Ionic
E
Metallic
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Hydrogen fluoride molecules are held together in larger aggregates by hydrogen bonds. While the individual hydrogen fluoride molecule (HF) is a polar covalent bond, the strong hydrogen bond between the hydrogen of one HF molecule and the highly electronegative fluorine of another HF molecule creates the larger aggregates.
Source: Myschool Past Questions Archive (Record #43546)
Chemistry
NECO SSCE 2008
Acids, Bases, and Salts
The action of zinc on an acid produces
A
chlorine
B
hydrogen
C
nitrogen
D
sulphur
E
water vapour.
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 #43550)
Chemistry
NECO SSCE 2008
Stoichiometry & Mole Concept
A solution is prepared by dissolving I .96g of H2SO4 in 250 cm3 of its solution. What is the concentration in moles per dm3?
A
0.008
B
0.08
C
0.1
D
0.8
E
8.02
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 #43552)
Chemistry
NECO SSCE 2008
Matter & Separation Techniques
Which of the following compounds is unsaturated?
A
Cyclohexane
B
Methoxyethane
C
1 ,2-dibromoethane
D
2,2,3-trimethylpentane
E
3-methylbut-l-ene
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #43553)
Chemistry
NECO SSCE 2008
Acids, Bases, and Salts
pH is define as
A
[H+]
B
–log [H]
C
–log [H+]
D
log [H]
E
log [H+]
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 #43554)
Chemistry
NECO SSCE 2008
Matter & Separation Techniques
Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of
A
combining volumes
B
conservation of mass
C
definite proportion
D
multiple proportion
E
reciprocal proportion.
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 #43555)
Chemistry
NECO SSCE 2008
Matter & Separation Techniques
Bauxite is the ore of
A
aluminium
B
calcium
C
Iron
D
sodium
E
magnesium
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 #43556)
Chemistry
NECO SSCE 2008
Atomic Structure and Periodic Table
Solution
An element Z has a combining power of 3. Which of the following formulae is correct of its compound?
A
ZS3
B
ZSO3
C
ZS04
D
Z203
E
Z3Cl2
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Since element Z has a combining power of 3, the correct formulae will be Z\(_2\)O\(_3\). Which means that Oxygen has a valency of 2. However, as they combine both Z and O will exchange their valencies. i.e Z takes the 2 from O while O takes the 3 from Z. Hence the formula will be Z\(_2\)O\(_3\).
Source: Myschool Past Questions Archive (Record #43558)