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 1981–1995 of 4783 verified questions
Sort by:
Chemistry
UTME / JAMB 2009
Basic Concepts of Organic Chemistry
Solution
Which of the following molecules has two other positional isomers?
A
CH3CH2Br
B
CH3CHBrCH3
C
CBr2F2
D
CH2CHBrCH2Br
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Positional isomers, also known as position isomers, are molecules with the same molecular formula and the same functional groups, but where the functional groups are in different positions on the carbon chain. This type of structural isomerism results in molecules with distinct properties despite having the same overall chemical composition.
In Option D, the compound CH\(_2\)CHBrCH\(_2\)Br (1,2- dibromopropane) has two other isomers with itself as 1,1-dibromopropane and 2,2-dibromopropane. Hence, it is the correct answer.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4348)
Chemistry
UTME / JAMB 2009
Basic Concepts of Organic Chemistry
Solution
Organic molecules that have the suffix-ene are unsaturated hydrocarbons that have?
A
a single bond
B
a double bond
C
a triple bond
D
an ionic bond
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
In chemistry, an alkene is a hydrocarbon containing a carbon–carbon double bond. Alkene is often used as synonym of olefin, that is, any hydrocarbon containing one or more double bonds.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4462)
Chemistry
NECO SSCE 2009
Basic Concepts of Organic Chemistry
Solution
Compound with the general formula CnH\(_{2n+2}\) belong to the_______ group
A
alkanal
B
alkane
C
alkanoate
D
alkene
E
alkyne
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Alkanes have the general formula of CnH2n+2 where n is the number of carbon atoms.
Alkenes have the general formula CnH2n.
The general formula for Alkynes is CnH2n-2.
Source: WAEC / JAMB / NECO Classroom Archive (Record #43668)
Chemistry
UTME / JAMB 2009
Electrochemistry and Redox
Solution
Cathode rays causes an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays?
A
are positively charged
B
are negatively charged
C
have mass
D
travel in straight lines
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Cathode rays travel in a straight line and can cast sharp shadows.
Cathode rays are negatively charged.
Electric field and magnetic field deflect cathode rays.
Source: Myschool Past Questions Archive (Record #4297)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
If 10.5g of lead (II) trioxonitrate (V) is dissolved in 20cm3 of distilled water at 18oC, the solubility of the solute in mol dm-3 is
[Pb = 207, N = 14, O = 16]
A
1.60
B
5.25
C
16.00
D
525.00
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 #4307)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
For a given solute, the concentration of its saturated solution in different solvents are
A
the same at the same temperature
B
different at the same temperature
C
the same at different temperature
D
constant
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 #4308)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
Solution
The major source of oxides of nitrogen is from the burning of
A
coal
B
wood
C
fuel
D
chlrofluorocarbons
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Nitrogen oxides form when fuel is burned at high temperatures
Source: Myschool Past Questions Archive (Record #4309)
Chemistry
UTME / JAMB 2009
Stoichiometry & Mole Concept
What volume of 1.5M solution of KOH would contain 0.045 moles
A
67.50 cm3
B
30.00 cm3
C
6.75 cm3
D
3.00 cm3
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 #4312)
Chemistry
UTME / JAMB 2009
Kinetics, Energetics and Equilibrium
The equilibrium of an endothermic reaction which proceeds with an increase in volume can be shifted in the reverse direction by
A
increasing the temperature and decreasing the pressure
B
increasing the pressure and increasing the temperature
C
decreasing the temperature and increasing the pressure
D
decreasing the pressure and decreasing the temperature
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 #4326)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
What current will deposit 3.25g of zinc in 2hrs?
[Zn = 65, F = 96500 mol-]
A
3.25A
B
2.00A
C
1.34A
D
0.67A
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 #4320)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
Diagram
Solution
In the diagram above, which of the curves represents the evolution of oxygen with time in the equation 2KClO3(s) → 2KCl(s) + 3O2(g)?
Attached Figure / Diagram
A
X
B
Y
C
Z
D
R
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
The curve that represents the evolution of oxygen over time for the reaction 2KClO\(_3\)(s) → 2KCl(s)+3O\(_2\)\(_g\) would start at a concentration of zero and then increase, with the rate of increase slowing down over time until it reaches a constant, maximum value.
At the beginning of the reaction (t=0), no oxygen has been produced. As the reaction proceeds, the amount of oxygen gas increases. The reaction rate is fastest at the start when the concentration of the reactant,KClO\(_3\), is highest. As the reactant is consumed, the rate of the reaction slows down, which is reflected in the curve's slope becoming less steep. Once all of the KClO\(_3\) has reacted, the amount of oxygen produced will no longer increase, and the curve will flatten out.
Source: Myschool Past Questions Archive (Record #4323)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
Solution
The gasification of coke is used for the manufacturing of?
A
producer gas
B
natural gas
C
synthetic gas
D
industrial gas
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Producer gas is manufactured by the partial combustion or gasification of coke (or coal) in a furnace where a limited supply of air and steam is passed through a red-hot bed of coke. This process yields a gaseous fuel consisting primarily of carbon monoxide (CO), hydrogen (H\(_2\)), and a high concentration of nitrogen (N\(_2\)) from the injected air.
Source: Myschool Past Questions Archive (Record #4329)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
In the electrolytic extraction of aluminum, the function of the molten cryolite is to
A
precipitate aluminium hdroxide
B
lower the melting point of aluminium oxide
C
act as a raw materials
D
act as a solvent
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 #4345)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
A cracking process in petroleum refining can be represented by
A
heptane to heptene
B
heptane to 3-methylhexane
C
heptane to propene and butane
D
heptane to 2,3,3-trimethybutane
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 #4347)
Chemistry
UTME / JAMB 2009
Matter & Separation Techniques
Which of the following class of compounds can exist as dipolar ions in solution?
A
Alkanoic acid
B
Fatty acids
C
Dialkanoic acids
D
Amino acids
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 #4349)