JAMB UTME - Chemistry - 2008
Swali 1 Ripoti
If glucose is heated with concentration tetraoxosulphate (VI) acid, it will be dehydrated to
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Swali 2 Ripoti
The atom of an element X is represented as \( {}^{y}_{z}X \). The basic chemical properties of X depend on the value of
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Swali 3 Ripoti
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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
Swali 4 Ripoti
In recharging a lead-acid accumulator, the reaction at the cathode can be represented as
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Swali 5 Ripoti
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
Swali 6 Ripoti
The rate of a reaction usually decrease in the concentration of reactants because
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Swali 7 Ripoti
Use the diagram to answer this question.
The colour of the fountain water is
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Swali 8 Ripoti
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
Swali 9 Ripoti
Detergents are manufactured with straight hydrocarbon chains so as to make them
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Swali 10 Ripoti
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
Swali 11 Ripoti
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]
Maelezo ya Majibu
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
Swali 12 Ripoti
NH3(g) + HCl(s) → NH4Cl(s)
The entropy change in the system above is
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Swali 13 Ripoti
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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Swali 14 Ripoti
The uncovered raw food that is sold along major roads is likely to contain some amounts of
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Swali 17 Ripoti
The IUPAC nomenclature for the structure above is
Swali 18 Ripoti
Reduction of alkanonoes with LialH4 produces
Swali 19 Ripoti
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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Swali 20 Ripoti
The experiment that showed that atoms have tiny positively charged nucleus was first carried out by
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Swali 21 Ripoti
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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Swali 22 Ripoti
Reduction of nitroalkanes, nitrites and amides is a route for the preparation of
Swali 28 Ripoti
Diffusion is slowest in solid particles than in particles of liquid and gases because
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Swali 30 Ripoti
\( {}^{11}_{11}\mathrm{Na}^{+1}_{0}\mathrm{n} \xrightarrow[11]{24} \mathrm{Na} \)
The reaction above is an example of
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Swali 32 Ripoti
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]
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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
Swali 33 Ripoti
In countries where the temperature falls below 273K, salt is always sprinkled on the icy road in order to
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Swali 35 Ripoti
Which of the following compounds of trioxonitrate (V) will decomposes to give dinitrogen (i) oxide and water when heated?
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Swali 36 Ripoti
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
Maelezo ya Majibu
HCl + NaOH → NaCl + H2O
CAVA = NA/NB = (0.05 * 32)/(CB * 25)
∴ CB = (0.05 * 32)/25 = 0.064 mol dm-3
Swali 37 Ripoti
A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formular
Maelezo ya Majibu
% 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
Swali 38 Ripoti
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Swali 40 Ripoti
If the silver mirror test is positive, it indicates the presence of an
Swali 42 Ripoti
In the periodic table, the electrical and thermal conductivities are properties of elements that
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Swali 43 Ripoti
The product obtained when a mixture of benzene vapour and hydrogen are passed over nickel catalyst at 180oC is
Swali 44 Ripoti
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.
Swali 45 Ripoti
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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Swali 46 Ripoti
Use the diagram to answer this question.
The gas that can be used to demonstrate the experiment is
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Swali 47 Ripoti
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Swali 48 Ripoti
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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Swali 49 Ripoti
When a few drops of water is added to a blue anhydrous cobalt (II) chloride, the colour changes to
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