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 12796–12810 of 14893 verified questions
Sort by:
Chemistry
UTME / JAMB 1985
Acids, Bases, pH & Salts
Some properties of chemical substances are mentioned below... i. sour taste ii. slippery touch iii. yields alkaline gas with ammonium salt iv. has pH less than 7 v. turns phenolphthalein pink.
Which of the above are NOT typical properties of alkalis?
A
i, iv and v
B
iv and v
C
i and iv
D
ii and v
E
ii, iii and iv
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 #44477)
Chemistry
UTME / JAMB 1985
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
A certain volume of gas at 298k is heated such that its volume and pressure are now four times the original values. What is the new temperature?
A
18.6k
B
100.0k
C
298.0k
D
1192.0k
E
4768.0k
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
\(\frac{P_1V_1}{T_1} = \frac{4P_1 \times 4V_1}{T_2}\)
i.e \(\frac{P_1V_1}{298} = \frac{4P_1 \times 4V_1}{T_2}\)
T2 = \(\frac{298 \times 4P_1 \times 4V_1}{P_1V_1}\)
= 298 + 16 = 4768.0k
Source: Myschool Past Questions Archive (Record #44478)
Chemistry
UTME / JAMB 1985
Acids, Bases, pH & Salts
Solution
Hydrogen is not liberated when trioxonitrate(v)acid reacts with zinc because
A
zinx is not rendered passive by acid
B
hydrogen produced is oxidized to water
C
oxides of nitrogen are produced
D
all nitrates are soluble in water
E
trioxonitrate(v)acid is a strong acid
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
When metals react with nitric acid, hydrogen gas is liberated. Nitric acid is a very strong oxidizing agent. So , it oxidizes the hydrogen gas formed during the reaction to form water and an oxide of nitrogen.
\(Zn+4HNO_{3} \to Zn(NO_{3})_{2} + 2NO_{2} + 2H_{2}O\)
Source: Myschool Past Questions Archive (Record #44479)
Chemistry
UTME / JAMB 1985
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
The boiling point of water, ethanol, toluene and butan-2-ol are 373.0k, 351.3k, 383.6k and 372.5k respectively. Which liquid has the highest vapour pressure at 323.0k?
A
water
B
toluene
C
ethanol
D
butan-2-ol
E
none
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 #44480)
Chemistry
UTME / JAMB 1985
Stoichiometry, Mole Concept & Volumetric Analysis
In what respect will two dry samples of nitrogen gas differ from each other if sample 1 is prepared by completely removing CO2 and O2 from air, and sample 2 is prepared by passing purified nitrogen(i)oxide over heated copper? sample 1 is
A
purer than sample 2
B
slightly denser than sample 2
C
in all respects the same as sample 2
D
colourless but sample 2 has a light brown colour
E
slightly less reactive than sample 2
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 #44481)
Chemistry
UTME / JAMB 1985
Nature of Matter & Separation Techniques
0.499g 0f CuSO4.xH2O when heated to constant weight gave a residue of 0.346g. the value of x is? (Cu = 63.5, S = 32.0, O = 16, H = 1)
A
0.5
B
2.0
C
3.0
D
4.0
E
5.0
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 #44471)
Chemistry
UTME / JAMB 1985
Stoichiometry, Mole Concept & Volumetric Analysis
In the experiment, which of the following observations would suggest that a solid sample is a mixture? The
A
solid can be ground to a fine powder
B
density of the solid is 2.25gdm-3
C
solid begins to melt at 573k but is not completely melted until 648k
D
solid absorbs moisture from the atmosphere and turns into liquid
E
solid melts at 300k
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 #44472)
Chemistry
UTME / JAMB 1985
Stoichiometry, Mole Concept & Volumetric Analysis
Hydrogen diffuses through a porous plug
A
at the same rate as oxygen
B
at a slower rate than oxygen
C
twice as fast as oxygen
D
three times as fast as oxygen
E
four times as fast as oxygen
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 #44474)
Chemistry
UTME / JAMB 1985
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Given that the molecular mass of iron is 56 and that of oxygen is 16, how many moles of iron(iii)oxide will be contained in 1kg of the compound?
A
25.0 moles
B
12.5 moless
C
6.25 moles
D
3.125 moles
E
0.625 moles
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Fe2O3 = 56 x 2 + 48 = 160 = 1 moles
1000gm will contain \(\frac{1000}{160}\) = 6.25 moles
Source: Myschool Past Questions Archive (Record #44475)
Chemistry
UTME / JAMB 1985
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
3.0g of a mixture of potassium carbonate and potassium chloride were dissolved were dissolved in a 250cm\(^3\) standard flask. 25cm\(^3\) of this solution required 40.00cm\(^3\) of 0.1M HCl for neutralization. What is the percentage by weight of K\(_2\)CO\(_3\) in the mixture ? (K = 39, O = 16, C = 12)
A
60
B
72
C
82
D
89
E
92
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
K\(_2\)CO\(_3\) + 2HCl → 2KCl + CO\(_2\) + H\(_2\)O
1 mole : 2 moles
n = \(\frac{CV}{1000}\)
n = \(\frac{{0.1}\times{40}}{1000}\)
n = 0.004 mole
Stoichiometrically, if 2 moles of HCl reacted with 1 mole of K\(_2\)CO\(_3\)
then, 0.004 mole of HCl will react with 0.002 mole of K\(_2\)CO\(_3\)
So, if 0.002 mole of K\(_2\)CO\(_3\) reacted with 25cm\(^3\) solution during titration
then, X mole of K\(_2\)CO\(_3\) will react with 250cm\(^3\) solution of mixture
X = \(\frac{{0.002}\times{250}}{25}\) = 0.02mole
Now, we need to get the mass of K\(_2\)CO\(_3\) by using the formula, n = \(\frac{mass}{Molar mass}\)
Molar mass of K\(_2\)CO\(_3\) = (39 x 2) + 12 + (16 x 3) = 138g/mol
Mass of K\(_2\)CO\(_3\) = n x M
= 0.02 X 138 = 2.76g
Recall that we were given the Mass of the mixture in the question to be = 3.0g
Therefore, % Weight = \(\frac{mass of {K_2}{CO_3}}{mass of mixture}\times 100\)
= \(\frac{2.76}{3}\times 100\)
= 92%
Source: Myschool Past Questions Archive (Record #44476)
Chemistry
UTME / JAMB 1985
Electrolysis & Electrochemical Cells
Solution
Copper sulphate solution is electolysed using platinum electrodes A. current of 0.193 amperes is passed for 2hrs. How many grams of copper are deposited? (cu = 63.5, F = 96500 coulombs)
A
0.457g
B
0.500g
C
0.882g
D
0.914g
E
1.00g
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Time = 2hrs = 120mins = 120 x 60secs =7200secs.
current = 0.193amps
Quantity of electricity = 7200 x 0.193 = 1389.6
2 x 96,500 deposits 63.5 gms of Cu
1389.6 will deposit \(\frac{63.5 \times 1389.6}{2 \times 96500}\)
= 0.457g
Source: Myschool Past Questions Archive (Record #44482)
English Language
UTME / JAMB 1985
Lexis, Structure & Register (Cloze & Vocabulary)
'Game of making house' means
A
building a house with sand
B
being happy in the house
C
playing in the house
D
imitating running a home like adults
E
playing hide-and-seek in the house
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Official Exam / Past Question Archive
Biology
UTME / JAMB 1985
Variety of Organisms & Classification of Living Things
In spirogyra, the pyrenoid
A
excretes waste products
B
is suspended by cytoplasmic strands
C
is mainly used for respiration
D
usually contains starch
E
makes the plants slimy to touch
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #2892)
Biology
UTME / JAMB 1985
Variety of Organisms & Classification of Living Things
In which of the following groups of animals are flagella and cilia found?
A
Flatworms
B
Annelids
C
Coelenterates
D
protozoa
E
Nematodes
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #2893)
Biology
UTME / JAMB 1985
Variety of Organisms & Classification of Living Things
Which of the following is seed bearing?
A
Mosses
B
Whistling pine
C
Algal filament
D
liverwort
E
Fern fronds
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #2894)