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 6361–6375 of 14893 verified questions
Sort by:
Chemistry
UTME / JAMB 2008
Kinetic Theory of Matter & Gas Laws
Solution
16.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off at s.t.p
[Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm3]
A
22.40 dm3
B
11.20 dm3
C
2.24 dm3
D
1.12 dm3
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
2NaHCO3(s) → Na2CO3(s) + H2O(l) + CO2
Relative molecular mass of NaHCO3 = 23 +1 + 12 + 16 * 3 = 84gmol-1
2 * 84g of NaHCO3 will be liberated 22.4dm3 or CO2 at s.t.p
16.8g of NaHCO3 will liberate (16.8 * 22.4)/(2 * 84) = 2.24 dm3
Source: Myschool Past Questions Archive (Record #4019)
Chemistry
UTME / JAMB 2008
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
300 cm3 of gas has a pressure of 800 mmHg. If the pressure is reduced to 650 mmHg, find its volume
A
243.75 cm3
B
369.23 cm3
C
738.46 cm3
D
1733.36 cm3
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
P1V1= P2V2
800 * 300 = 650 * V2
V2 = (800 * 300)/650 = 369.23 cm3
Source: Myschool Past Questions Archive (Record #4020)
Chemistry
UTME / JAMB 2008
Kinetic Theory of Matter & Gas Laws
Solution
Diffusion is slowest in solid particles than in particles of liquid and gases because
A
solid particles have more kinetic energy than the particles of liquid and gases
B
solid particles have less kinetic energy than the particles of liqiud and gases
C
solid particles have less restriction in their movement than liquid and gas particles
D
the particles in solids are far apart and the cohesive forces between them are negligible
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Diffusion is faster in gases owing to their higher kinetic energy i.e increase in kinetic energy of molecules leads to increase in rate of diffusion.
Source: Myschool Past Questions Archive (Record #4021)
Chemistry
UTME / JAMB 2008
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
The experiment that showed that atoms have tiny positively charged nucleus was first carried out by
A
Moseley
B
Rutherford
C
Millikan
D
Dalton
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The experiment that showed that atoms have tiny positively charged nuclei was first carried out by Rutherford. Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively charged nucleus.
Source: Myschool Past Questions Archive (Record #4022)
Chemistry
UTME / JAMB 2008
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
The atom of an element X is represented as \(_z^yX\). The basic chemical properties of X depends on the value of
A
Y
B
Z
C
Y - Z
D
Z - Y
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The chemical properties of elements depend on their atomic numbers. The atomic number is represented by Z.
Source: Myschool Past Questions Archive (Record #4023)
Chemistry
UTME / JAMB 2008
Atomic Structure, Orbitals & Nuclear Chemistry
Diagram
Solution
The diagram above represent the electron sub-level for
Attached Figure / Diagram
A
carbon
B
nitrogen
C
oxygen
D
flourine
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The number of arrows indicates the number of electrons. Since the atomic number of oxygen is 8, the element is oxygen.
Source: Myschool Past Questions Archive (Record #4024)
Chemistry
UTME / JAMB 2008
Periodic Table & Periodicity
Solution
In the periodic table, the electrical and thermal conductivities are properties of elements that
A
decrease across the period and increase down the group
B
increase across the period and decrease down the group
C
decrease across the period and down the group`
D
increase acrosss the period and down the group
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
In the periodic table, electrical and thermal conductivities of elements decrease across the period and increase down the group.
Source: Myschool Past Questions Archive (Record #4025)
Chemistry
UTME / JAMB 2008
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
\( _{11} ^{23}Na + _0^1n → _{11}^{24}Na \)
The reaction above is an example of
A
nuclear fission
B
nuclear fusion
C
artificial transmutation
D
beta decay
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Artificial transmutation. It is an artificially induced nuclear reaction caused by the bombardment of a nucleus with subatomic particles or small nuclei. It is also called artififcial radioactivity.
Source: Myschool Past Questions Archive (Record #4028)
Chemistry
UTME / JAMB 2008
Periodic Table & Periodicity
Solution
Air boiled out of water as steam is richer in
A
nitrogen and oxygen
B
carbon (IV) oxide and oxygen
C
noble gases and carbon (IV) oxide
D
oxygen and noble gases
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Air boiled out of water as steam is richer in carbon(IV)oxide and oxygen.
Source: Myschool Past Questions Archive (Record #4029)
Chemistry
UTME / JAMB 2008
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
When a few drops of water is added to a blue anhydrous cobalt (II) chloride, the colour changes to
A
white
B
pink
C
red
D
blue
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Blue anhydrous cobalt (II) chloride changes to pink in water.
Source: Myschool Past Questions Archive (Record #4032)
Chemistry
UTME / JAMB 2008
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
The vulcanizer's solution is prepared by dissolving rubber in
A
ethanol
B
kerosine
C
benzene
D
petrol
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Dissolved rubber in benzene makes the vulcanizer's solution.
Source: Myschool Past Questions Archive (Record #4034)
Chemistry
UTME / JAMB 2008
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
117.0g of sodium chloride was dissolved in 1.0dm3 of distilled water at 25^\circC. Determine the solubility in mol dm-3 of sodium chloride at that temperature
[Na = 23, Cl = 35.5]
A
1.0
B
2.0
C
3.0
D
4.0
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Relative molecular mass of NaCl = 23 + 35.5 = 58.5 g/mol
No. of mole of NaCl = 117/58.5 = 2.0 mol
Source: Myschool Past Questions Archive (Record #4035)
Chemistry
UTME / JAMB 2008
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The uncovered raw food that is sold along major roads is likely to contain some amounts of
A
Pb
B
Cu
C
Ag
D
Na
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The uncovered raw food that is sold along major roads is likely to contain some amounts of lead(Pb).
Source: Myschool Past Questions Archive (Record #4036)
Chemistry
UTME / JAMB 2008
Acids, Bases, pH & Salts
Solution
What is the pH of 0.001 mol dm-3 solution of sodium hydroxide
A
14
B
13
C
12
D
11
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
\([H^+] [OH^-] = 10^{-14}\)
\([H^+] = 10^{-14}/[OH^-] = 10^{-14}/(1 * 10^{-3}) = 10^{-11}\)
pH = -Log10[H+]
= - Log10[10-11] = - 1 * -11 Log10[10-11] = 1 = -1 * -11 * 1 = 11
Source: Myschool Past Questions Archive (Record #4041)
Chemistry
UTME / JAMB 2008
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The basicity of CH3COOH is
A
1
B
2
C
3
D
4
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The basicity of CH3COOH is 1. Which means it has just one ionizable ion.
Source: Myschool Past Questions Archive (Record #4042)