JAMB UTME - Chemistry - 2008
Question 1 Report
The oxidation state of carbon in HCOOH is
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HCOOH
O.N of H + O.N of C + 2* O.N of oxygen of
H = 0
1 + X + 2X - 2 + 1 = 0
2 + X -4 = 0
X = 4 - 2 = +2
Question 3 Report
The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is
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Question 4 Report
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Question 5 Report
The experiment that showed that atoms have tiny positively charged nucleus was first carried out by
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Question 6 Report
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The correct answer is 11.
pH = -log(H+) Or 14 - pOH
pOH = -log(0.001)
pOH = 3
pH = 14 - 3 = 11
Question 7 Report
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium.
[H = 1, O = 16, Na = 23]
Answer Details
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
Relative molecular mass of NaOH = 23 + 16 + 1 = 40smol-1
2 * 23g of sodium react with water to produce
2 * 40g of NaOH
∴ 2.3g of sodium will react with water to produce
(2.3 * 40 * 2)/(23 * 2) = 4.00g
Question 8 Report
In countries where the temperature falls below 273K, salt is always sprinkled on the icy road in order to
Question 9 Report
The atom of an element X is represented as yzX . The basic chemical properties of X depend on the value of
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Question 10 Report
If glucose is heated with concentration tetraoxosulphate (VI) acid, it will be dehydrated to
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Question 11 Report
When a few drops of water is added to a blue anhydrous cobalt (II) chloride, the colour changes to
Question 12 Report
117.0g of sodium chloride was dissolved in the solubility in 1.0dm3 of distilled water at 25oC. Determine the solubility in mol dm-3 of sodium chloride at that temperature
[Na = 23, Cl = 35.5]
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Relative molecular mass of NaCl = 23 + 35.5 = 55.5 g/mol
No. of mole of NaCl = 117/55.5 = 2.1 mol
Question 13 Report
Choose the correct option from the structure above
Question 14 Report
Reduction of nitroalkanes, nitrites and amides is a route for the preparation of
Question 15 Report
Use the diagram to answer this question.
The gas that can be used to demonstrate the experiment is
Question 18 Report
In the periodic table, the electrical and thermal conductivities are properties of elements that
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Question 20 Report
If a given quantity of electricity liberates 0.65g of Zn2+, what amount of Hg2+ would be liberated by the same quantity of current?
[Zn = 65, Hg = 201]
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Question 21 Report
A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formular
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% of H2 = 100 - 92.3 = 7.7%
mole = 92.3/12 7.7/1
7.1/7.1 7.1/7.1
empirical formula = CH
(CH)n = 26
(12 + 1)n = 26
(13)n = 26
n = 26/13 = 2
molecular formula = C2H2
Question 23 Report
16.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off s.t.p
[Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm3]
Answer Details
2NaHCO3(s) → Na2CO3(s) + H2O(l) + CO2
Relative molecular mass of NaHCO3 = 23 +1 + 12 + 16 * 3 = 84smol-1
2 * 84g of NaHCO3 will be liberated 22.4dm3 or CO2 at s.t.p
16.8g of NaHCO3 will libertae (16.8 * 22.4)/(2 * 84) = 2.24 dm3
Question 24 Report
Diffusion is slowest in solid particles than in particles of liquid and gases because
Question 26 Report
Chlorophyll obtained from given leaves of plant can be shown to be composed of more than one coloured component by the technique of
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Question 27 Report
Which of the following compounds of trioxonitrate (V) will decomposes to give dinitrogen (i) oxide and water when heated?
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Question 28 Report
1111Na+10n→2411Na
The reaction above is an example of
Question 29 Report
When a solution of ammonium trioxocarbonate (IV) is added to a solution of an unknown salt, a white precipitate which is soluble in dilute hydrochloric acid but insoluble in ethanoic acid is formed. This indicates the presence of
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Question 30 Report
0.05 mol dm-3 HCl is neutralized by 25 cm3 NaOH. If the volume of acid used is 32.00cm3, what is the concentration of the base
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HCl + NaOH → NaCl + H2O
CAVA = NA/NB = (0.05 * 32)/(CB * 25)
∴ CB = (0.05 * 32)/25 = 0.064 mol dm-3
Question 32 Report
The rate of a reaction usually decrease in the concentration of reactants because
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Question 33 Report
300 cm3 of gas has a pressure of 800 mmHg. If the pressure is reduced to 650 mmHg, find its volume
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P1V1= P2V2
800 * 300 = 650 * V2
V2 = (800 * 300)/650 = 369.23 cm3
Question 37 Report
The IUPAC nomenclature for the structure above is
Question 39 Report
If the silver mirror test is positive, it indicates the presence of an
Question 40 Report
Detergents are manufactured with straight hydrocarbon chains so as to make them
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Question 41 Report
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Question 42 Report
The uncovered raw food that is sold along major roads is likely to contain some amounts of
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Question 43 Report
In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove
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Question 44 Report
NH3(g) + HCl(s) → NH4Cl(s)
The entropy change in the system above is
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Question 45 Report
Insoluble salts can be prepared by
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Two soluble metal salts react with each other to form one soluble salt and one insoluble salt . Lead nitrate solution and sodium chloride solution react to produce solid lead chloride , leaving soluble sodium nitrate in solution. The lead chloride can be recovered by filtration.
Question 46 Report
Reduction of alkanonoes with LialH4 produces
Question 47 Report
Use the diagram to answer this question.
The colour of the fountain water is
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Question 48 Report
In recharging a lead-acid accumulator, the reaction at the cathode can be represented as
Question 49 Report
The product obtained when a mixture of benzene vapour and hydrogen are passed over nickel catalyst at 180oC is
