JAMB UTME - Chemistry - 2008
Tambaya 1 Rahoto
Insoluble salts can be prepared by
Bayanin Amsa
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.
Tambaya 2 Rahoto
In the periodic table, the electrical and thermal conductivities are properties of elements that
Tambaya 3 Rahoto
Chlorophyll obtained from given leaves of plant can be shown to be composed of more than one coloured component by the technique of
Bayanin Amsa
Tambaya 6 Rahoto
300 cm3 of gas has a pressure of 800 mmHg. If the pressure is reduced to 650 mmHg, find its volume
Bayanin Amsa
P1V1= P2V2
800 * 300 = 650 * V2
V2 = (800 * 300)/650 = 369.23 cm3
Tambaya 7 Rahoto
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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Tambaya 8 Rahoto
1111Na+10n→2411Na
The reaction above is an example of
Tambaya 9 Rahoto
Reduction of alkanonoes with LialH4 produces
Tambaya 10 Rahoto
The oxidation state of carbon in HCOOH is
Bayanin Amsa
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
Tambaya 11 Rahoto
Tambaya 12 Rahoto
What is the IUPAC nomenclature of the compound NaCIO?
Tambaya 13 Rahoto
A catalyst speeds up the rate of chemical reaction by
Tambaya 14 Rahoto
In countries where the temperature falls below 273K, salt is always sprinkled on the icy road in order to
Tambaya 15 Rahoto
If glucose is heated with concentration tetraoxosulphate (VI) acid, it will be dehydrated to
Tambaya 16 Rahoto
The uncovered raw food that is sold along major roads is likely to contain some amounts of
Tambaya 17 Rahoto
Bayanin Amsa
The correct answer is 11.
pH = -log(H+) Or 14 - pOH
pOH = -log(0.001)
pOH = 3
pH = 14 - 3 = 11
Tambaya 18 Rahoto
The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is
Bayanin Amsa
Tambaya 19 Rahoto
The diagram above represent the electron sub-level for
Tambaya 20 Rahoto
Use the diagram to answer this question.
The colour of the fountain water is
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Tambaya 22 Rahoto
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]
Bayanin Amsa
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
Tambaya 23 Rahoto
The rate of a reaction usually decrease in the concentration of reactants because
Tambaya 25 Rahoto
When a few drops of water is added to a blue anhydrous cobalt (II) chloride, the colour changes to
Tambaya 26 Rahoto
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
Bayanin Amsa
HCl + NaOH → NaCl + H2O
CAVA = NA/NB = (0.05 * 32)/(CB * 25)
∴ CB = (0.05 * 32)/25 = 0.064 mol dm-3
Tambaya 27 Rahoto
Diffusion is slowest in solid particles than in particles of liquid and gases because
Tambaya 28 Rahoto
If the silver mirror test is positive, it indicates the presence of an
Tambaya 29 Rahoto
The atom of an element X is represented as yzX . The basic chemical properties of X depend on the value of
Tambaya 31 Rahoto
Use the diagram to answer this question.
The gas that can be used to demonstrate the experiment is
Tambaya 32 Rahoto
The IUPAC nomenclature for the structure above is
Tambaya 33 Rahoto
The product obtained when a mixture of benzene vapour and hydrogen are passed over nickel catalyst at 180oC is
Tambaya 34 Rahoto
Leads is used for making bullets and lead shots because of its
Tambaya 35 Rahoto
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]
Bayanin Amsa
Relative molecular mass of NaCl = 23 + 35.5 = 55.5 g/mol
No. of mole of NaCl = 117/55.5 = 2.1 mol
Tambaya 37 Rahoto
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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Tambaya 38 Rahoto
Tambaya 39 Rahoto
The type of isomerism shown by cis- and trans- isomers is
Tambaya 40 Rahoto
The experiment that showed that atoms have tiny positively charged nucleus was first carried out by
Tambaya 41 Rahoto
Which of the following compounds of trioxonitrate (V) will decomposes to give dinitrogen (i) oxide and water when heated?
Tambaya 42 Rahoto
In recharging a lead-acid accumulator, the reaction at the cathode can be represented as
Tambaya 43 Rahoto
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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Tambaya 44 Rahoto
The basicity of CH3COOH is
Tambaya 45 Rahoto
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]
Bayanin Amsa
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
Tambaya 46 Rahoto
The most common ores of iron include
Tambaya 47 Rahoto
Choose the correct option from the structure above
Tambaya 48 Rahoto
A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formular
Bayanin Amsa
% 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
Tambaya 49 Rahoto
Reduction of nitroalkanes, nitrites and amides is a route for the preparation of
