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Chemistry
NECO SSCE 2008
Atomic Structure and Periodic Table
Solution
The type of reaction ethyne mainly undergoes is
A
addition
B
carboxylation.
C
esterification
D
saponification
E
substitution
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The correct answer is A. Addition reaction
Ethyne (also known as acetylene) is an alkyne, a type of unsaturated hydrocarbon. Alkynes are characterized by their triple bond, which makes them highly reactive.
Ethyne mainly undergoes addition reactions, where molecules add to the triple bond. Examples of addition reactions involving ethyne include:
- Hydrogenation (addition of hydrogen)
- Halogenation (addition of halogens, such as chlorine or bromine)
- Hydration (addition of water)
The other options are not correct:
B. Carboxylation is a reaction that involves the addition of a carboxyl group (-COOH), which is not a typical reaction for ethyne.
C. Esterification is a reaction between an acid and an alcohol to form an ester, which is not relevant to ethyne.
D. Substitution reactions involve replacing one atom or group with another, which is not the primary type of reaction undergone by ethyne.
Source: Myschool Past Questions Archive (Record #43529)
Chemistry
NECO SSCE 2008
Matter & Separation Techniques
Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m5Nm-2pressure becomes 300cm3 at 1.0 × 105Nm-2 pressure?
A
Avogadro’s
B
Boyle’s
C
Charles’
D
Faraday’s
E
Graham’s
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 #43530)
Chemistry
NECO SSCE 2008
Atomic Structure and Periodic Table
Solution
Chlorine atom forms Cl- by
A
donating lone pair of electrons
B
gaining an electron
C
losing an electron
D
sharing an electron
E
sharing a lone pair of electrons.
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Chlorine is a non-metal and non-metals ionize by gaining electron(s)
Source: Myschool Past Questions Archive (Record #43531)
Chemistry
NECO SSCE 2008
Acids, Bases, and Salts
The most efficient absorber of ultraviolet radiation in the atmosphere is
A
CO2
B
H2
C
H2O
D
02
E
O3
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 #43532)
Chemistry
NECO SSCE 2008
Acids, Bases, and Salts
When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as
A
Brownian movement.
B
Dialysis
C
Diffusion
D
Osmosis
E
Tyndall effect
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 #43533)
Chemistry
NECO SSCE 2008
Matter & Separation Techniques
\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is
A
\( ^0_1e \)
B
\( ^0_{-1}e \)
C
\( ^4_2He \)
D
\( ^1_0n \)
E
\( ^1_1p\)
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 #43534)
Chemistry
NECO SSCE 2008
Acids, Bases, and Salts
What is the colour of phenolphthalein indicator in a basic medium?
A
Blue
B
Colourless
C
Orange
D
Pink
E
Yellow
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 #43535)
Chemistry
NECO SSCE 2008
Matter & Separation Techniques
Which of the following will Increase the rate of reaction of Chips of a metal M as shown in the equation below?
M(s)+2HC1(aq) → MCI2 (aq) + H2(g)
A
Adding some distilled water
B
Decreasing the temperature
C
Diluting the hydrochloric acid
D
Grinding the metal into powder
E
Increasing the pressure
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 #43536)
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)