JAMB UTME - Chemistry - 1981
Tambaya 1 Rahoto
If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ?
Bayanin Amsa
Tambaya 2 Rahoto
Which of the following is NOT a true statement of the kinetic Theory of Gases?
Tambaya 3 Rahoto
28.8 cm3 of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?
Tambaya 4 Rahoto
When sodium nitrate dissolves in water, ∆H is positive. This means that?
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Tambaya 5 Rahoto
Which one of the following metals is not normally extracted by chemical reduction because of its position in the electrochemical series?
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Tambaya 7 Rahoto
In the preparation of ammonia, which of the following is used as the drying agent?
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Tambaya 8 Rahoto
When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
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Tambaya 9 Rahoto
Which of the following statements about phosphorus is NOT correct?
Tambaya 12 Rahoto
The brown coloration in nitric acid prepared in the laboratory can be removed by?
Tambaya 13 Rahoto
A polymerization reaction is one in which?
Tambaya 14 Rahoto
Which of the following compounds and elements would sublime on exposure to the atmosphere?
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Tambaya 15 Rahoto
Na2CO3 + 2HCI → 2NaCI + H2O + CO2. Using the above equation, what volume of carbondioxide, measured at s.t.p is liberated when 53g of sodium carbonate is dissolved in hydrochloric acid?
(1 mole of gas occupies 22.4 dm3 at s.t.p)
(Na = 23, C = 12, O = 16)
Tambaya 16 Rahoto
The electronic configuration of elements X and Y are X = 2, 8, 6; Y = 2, 8, 7. The bond in the compound formed by X and Y is expected to be?
Tambaya 17 Rahoto
The mass number of an atom is?
Tambaya 19 Rahoto
In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?
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Tambaya 20 Rahoto
If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)
Tambaya 22 Rahoto
The scale formation in a kinetic used for boiling water is caused by the presence in water of?
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Tambaya 24 Rahoto
When glowing splint is inserted into the mouth of a jar containing a gas, the splint is extinguished. The gas gives a white precipitate when passing into barium hydroxide. The gas is?
Tambaya 25 Rahoto
What mass of sodium carbonate solution is in 500 cm3 of 0.1 molar sodium carbonate solution?
(Na = 23, C = 12, O = 16)
Tambaya 26 Rahoto
When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
Tambaya 27 Rahoto
An efflorescent compound is a substance that?
Tambaya 28 Rahoto
In the reaction
C + 2HNO3 → CO2 + NO2 + NO + H2O nitric acid is acting as?
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Tambaya 29 Rahoto
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
Tambaya 30 Rahoto
Pure sulphuric acid is a liquid of 1:84 density. What volume of it would be required to prepare 250 cm3 of 2.0 M solution?
(H = 1, S = 32, O = 16)
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Tambaya 32 Rahoto
If 48,000 coulombs of electricity are required to discharge 0.5 mole of sodium from a molten sodium chloride mass, then the number of coulombs required to discharge 2 moles of lead from molten lead (ll) chloride is?
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Tambaya 34 Rahoto
The general formula of an alkyl halide (which represent the halide) is?
Tambaya 35 Rahoto
What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?
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Tambaya 37 Rahoto
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?
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Tambaya 38 Rahoto
If an organic compound decolorizes bromine water then the compound is?
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Tambaya 39 Rahoto
5cm3 of a saturated solution of sodium chloride at 30°C gave, on careful evaporation, 1.95g of solid salt. The solubility of sodium chloride at 30°C?
(Na = 23, Cl = 35.5)
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Tambaya 40 Rahoto
Methane is member of the homologous series called?
Tambaya 42 Rahoto
In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
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Tambaya 44 Rahoto
An element X has 127 neutrons and 82 electrons.
Its atomic number is?
Tambaya 45 Rahoto
The IUPAC name for
Tambaya 46 Rahoto
4g each of aluminium foil and aluminium powder were introduced respectively into flasks P and Q.
Flask P was treated with warm bench sodium hydroxide and all the aluminium dissolved in one hour. Flask Q was treated with cold sodium hydroxide and all the aluminium dissolved in 10 minutes. What was responsible for Q reacting faster than P?
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Tambaya 47 Rahoto
Sodium and potassium belong to the same group of the Periodic Table. This is because?
Tambaya 49 Rahoto
The following compounds are given with their corresponding boiling points.
Compound Boiling Point
i.................................14°C
ii................................24°C
iii................................0°C
iv................................120°C
V.................................-2°C
From the above information, indicate which of the following is correct?
