JAMB UTME - Chemistry - 1981
Ibeere 1 Ìròyìn
If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)
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Ibeere 3 Ìròyìn
What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?
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Ibeere 4 Ìròyìn
When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
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Ibeere 6 Ìròyìn
The scale formation in a kinetic used for boiling water is caused by the presence in water of?
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Ibeere 9 Ìròyìn
In the preparation of ammonia, which of the following is used as the drying agent?
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Ibeere 10 Ìròyìn
If an organic compound decolorizes bromine water then the compound is?
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Ibeere 14 Ìròyìn
An element X has 127 neutrons and 82 electrons.
Its atomic number is?
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Ibeere 15 Ìròyìn
Which of the following compounds and elements would sublime on exposure to the atmosphere?
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Ibeere 16 Ìròyìn
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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Ibeere 18 Ìròyìn
In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
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Ibeere 20 Ìròyìn
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?
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Ibeere 21 Ìròyìn
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
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Ibeere 22 Ìròyìn
What mass of sodium carbonate solution is in 500 cm3 of 0.1 molar sodium carbonate solution?
(Na = 23, C = 12, O = 16)
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Ibeere 24 Ìròyìn
When sodium nitrate dissolves in water, ∆H is positive. This means that?
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Ibeere 25 Ìròyìn
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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Ibeere 26 Ìròyìn
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)
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Ibeere 29 Ìròyìn
Which of the following statements about phosphorus is NOT correct?
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Ibeere 30 Ìròyìn
Which of the following is NOT a true statement of the kinetic Theory of Gases?
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Ibeere 31 Ìròyìn
The general formula of an alkyl halide (which represent the halide) is?
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Ibeere 33 Ìròyìn
Which of the following processes takes place during electrolysis?
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Ibeere 35 Ìròyìn
The brown coloration in nitric acid prepared in the laboratory can be removed by?
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Ibeere 37 Ìròyìn
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?
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Ibeere 38 Ìròyìn
28.8 cm3 of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?
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Ibeere 39 Ìròyìn
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?
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Ibeere 40 Ìròyìn
In the reaction
C + 2HNO3 → CO2 + NO2 + NO + H2O nitric acid is acting as?
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Ibeere 41 Ìròyìn
Sodium and potassium belong to the same group of the Periodic Table. This is because?
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Ibeere 42 Ìròyìn
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?
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Ibeere 44 Ìròyìn
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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Ibeere 45 Ìròyìn
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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Ibeere 46 Ìròyìn
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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Ibeere 47 Ìròyìn
When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
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Ibeere 48 Ìròyìn
In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?
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Ibeere 49 Ìròyìn
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 ?
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