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Chemistry
NECO SSCE 2009
Matter & Separation Techniques
Solution
The furring of kettles and boilers are caused by
A
calcium hydroxide
B
calcium hydrogen trioxocarbonate (IV)
C
calcium trioxocarbonate (IV)
D
calcium tetraoxocarbonate
E
magnesium tetraoxocarbonate (VI)
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The furring of kettles or boilers - this is as a result of the decomposition of Ca(HCO3)2 into CaCO3, and this coats the inside of a kettle or boiler used in heating water containing dissolved Ca(HCO3)2.
Source: Myschool Past Questions Archive (Record #43723)
Chemistry
NECO SSCE 2009
Atomic Structure and Periodic Table
Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding
A
covalent
B
dative
C
electrovalent
D
hydrogen
E
metallic
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 #43724)
Chemistry
NECO SSCE 2009
Stoichiometry & Mole Concept
Solution
The Ideal Gas Law is expressed mathematically as
A
P1 /T1 = P2/T2
B
P1/V1 = P2V2
C
PV =nRT
D
PV =KT
E
V1/T1 = V2/T2
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The empirical relationships among the volume, the temperature, the pressure, and the amount of a gas can be combined into the ideal gas law, PV = nRT.
Source: Myschool Past Questions Archive (Record #43725)
Chemistry
NECO SSCE 2009
Stoichiometry & Mole Concept
Non-polar molecules are held together by
A
co-ordinate bond
B
covalent bond
C
electromagnetic force
D
hydrogen bond
E
Van der Waals forces
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 #43727)
Chemistry
NECO SSCE 2009
Acids, Bases, and Salts
Which of the following salt solutions will have a pH greater than 7?
A
NaCl
B
NaHSO4
C
Na2CO4
D
Na2SO4
E
MgCl2
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 #43728)
Chemistry
NECO SSCE 2009
Kinetics, Energetics and Equilibrium
The relationship between equilibrium constant and free energy change is represented as
A
δ G ° =-nFE °
B
δG °-RT ln K
C
δ G °= + RT In k
D
δG ° = δH – T S
E
H=TδS
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 #43729)
Chemistry
NECO SSCE 2009
Matter & Separation Techniques
Which of the following is a solid at room temperature?
A
Argon
B
Bromine
C
Chlorine
D
Fluorine
E
Iodine
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 #43730)
Chemistry
NECO SSCE 2009
Matter & Separation Techniques
The green house effect is a climatic condition associated with the presence of excess
A
carbon (II) oxide
B
carbon (IV) oxide
C
hydrogen sulphide
D
nitrogen (II) oxide
E
oxygen
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 #43731)
Chemistry
NECO SSCE 2009
Acids, Bases, and Salts
Solution
The following are ores of metals EXCEPT
A
bauxite
B
dolomite
C
graphite
D
haematite
E
magnetite
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
So Dolomite is a magnesium ore, haematite, and magnetite is an iron ore, Bauxite is an aluminum ore while graphite is not a metal ore but a crystalline allotrope form of carbon.
Source: Myschool Past Questions Archive (Record #43732)
Chemistry
NECO SSCE 2009
Matter & Separation Techniques
Ptotal = P1 + P2 + P3 +…………. Pn, is an expression of law
A
Boyle’s
B
Charles’
C
Dalton’s
D
Graham’s
E
Gay Lussac’s
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 #43733)
Chemistry
NECO SSCE 2009
Matter & Separation Techniques
All the following belong to the same family EXCEPT
A
glycerol
B
nylon
C
perspex polyethene
D
polyethene
E
polystyrene
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 #43734)
Chemistry
NECO SSCE 2009
Atomic Structure and Periodic Table
How many atoms of chlorine are required to saturate the double bonds of a compound containing a triene?
A
2
B
3
C
4
D
5
E
6
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 #43735)
Chemistry
NECO SSCE 2009
Acids, Bases, and Salts
Solution
Which of the following gases is absorbed from the air due to photosynthesis?
A
Carbon (II) oxide
B
Carbon (IV) oxide
C
Nitrogen
D
Noble gases
E
Oxygen
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The gas that is absorbed from the air due to photosynthesis is carbon dioxide (CO₂). During this process, plants take in carbon dioxide from the atmosphere and, using sunlight, convert it into glucose and oxygen
Source: Myschool Past Questions Archive (Record #43736)
Chemistry
NECO SSCE 2009
Matter & Separation Techniques
X = - log10 H+]
What does X stand for in the expression above?
A
Degree of acidity
B
Enthalpy change
C
Equilibrium constant
D
Ionic product of water
E
Solubility product
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 #43737)
Chemistry
NECO SSCE 2009
Matter & Separation Techniques
During the extraction of iron in the blast furnance, slag is produced using
A
carbon
B
crylite
C
limestone
D
oxygen
E
sulphur
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 #43738)