Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 2221–2235 of 4783 verified questions
Sort by:
Chemistry
NECO SSCE 2008
Chemical Bonding & Intermolecular Forces
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
Stoichiometry, Mole Concept & Volumetric Analysis
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 & Volumetric Analysis
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
Organic Chemistry I: Hydrocarbons & Crude Oil
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
Stoichiometry, Mole Concept & Volumetric Analysis
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
Particulate Nature of Matter, Laws & Formulae
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
Metals, Transition Elements & Extraction
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
Particulate Nature of Matter, Laws & Formulae
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)
Chemistry
NECO SSCE 2008
Stoichiometry, Mole Concept & Volumetric Analysis
The following acids are monobasic EXCEPT
A
dioxonitrate (Ill) acid
B
ethanedioic acid
C
hydrobromic acid
D
methanoic acid
E
oxochlorate (I) acid
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 #43559)
Chemistry
NECO SSCE 2008
Periodic Table & Periodicity
Which of these arrangement of elements is in order of increasing ionization energy?
A
Boron, Carbon, Flourine, Nitrogen
B
Boron, Carbon, Nitrogen, Flourine
C
Carbon, Boron, Nitrogen, Flourine
D
Flourine, Nitro9en, Carbon, Boron
E
Nitrogen, Flourine, Carbon, Boron
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 #43560)
Chemistry
NECO SSCE 2008
Stoichiometry, Mole Concept & Volumetric Analysis
The gas in air used by plants for photosynthesis is
A
Argon
B
Carbon (IV) oxide
C
Nitrogen
D
Oxygen
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 #43562)
Chemistry
NECO SSCE 2008
Acids, Bases, pH & Salts
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because
A
sodium hydroxide is a strong alkali
B
sodium is more reactive than zinc
C
zinc is more reactive than sodium
D
zinc hydroxide is amphoteric
E
zinc hydroxide is unstable
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 #43563)
Chemistry
NECO SSCE 2008
Stoichiometry, Mole Concept & Volumetric Analysis
A chemical system is at equilibrium when
A
δ G is positive
B
δ G is zero
C
δ S is negative
D
δ S is positive
E
δ S is zero.
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 #43564)
Chemistry
NECO SSCE 2008
Kinetic Theory of Matter & Gas Laws
Brownian motion explains
A
Boyle’s law
B
Collision theory
C
Laws of chemical combination
D
Molecular motion in liquids and gases
E
Vibrational motion in liquids.
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 #43565)
Chemistry
NECO SSCE 2008
Stoichiometry, Mole Concept & Volumetric Analysis
The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces
A
calcium chloride, carbon (IV) oxide and water
B
calcium chloride, and trioxocarbonate (IV) acid
C
calcium hydroxide, carbon (IV) oxide and chlorine gas
D
calcium hydroxide, carbon (IV) oxide and water
E
calcium metal and water.
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 #43567)