JAMB UTME - Chemistry - 1981
Swali 1 Ripoti
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?
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Swali 3 Ripoti
In the preparation of ammonia, which of the following is used as the drying agent?
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Swali 5 Ripoti
When sodium nitrate dissolves in water, ∆H is positive. This means that?
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Swali 7 Ripoti
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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Swali 9 Ripoti
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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Swali 10 Ripoti
What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?
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Swali 13 Ripoti
If an organic compound decolorizes bromine water then the compound is?
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Swali 14 Ripoti
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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Swali 15 Ripoti
In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?
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Swali 16 Ripoti
In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
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Swali 17 Ripoti
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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Swali 18 Ripoti
Which of the following statements is NOT true of electrovalent compounds?
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Swali 21 Ripoti
Sodium and potassium belong to the same group of the Periodic Table. This is because?
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Swali 22 Ripoti
The general formula of an alkyl halide (which represent the halide) is?
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Swali 24 Ripoti
An element X has 127 neutrons and 82 electrons.
Its atomic number is?
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Swali 25 Ripoti
The scale formation in a kinetic used for boiling water is caused by the presence in water of?
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Swali 26 Ripoti
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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Swali 27 Ripoti
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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Swali 29 Ripoti
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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Swali 31 Ripoti
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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Swali 32 Ripoti
The brown coloration in nitric acid prepared in the laboratory can be removed by?
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Swali 33 Ripoti
Which of the following compounds and elements would sublime on exposure to the atmosphere?
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Swali 34 Ripoti
In the reaction
C + 2HNO3 → CO2 + NO2 + NO + H2O nitric acid is acting as?
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Swali 35 Ripoti
When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
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Swali 36 Ripoti
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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Swali 38 Ripoti
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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Swali 39 Ripoti
Which of the following statements about phosphorus is NOT correct?
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Swali 40 Ripoti
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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Swali 41 Ripoti
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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Swali 45 Ripoti
When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
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Swali 46 Ripoti
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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Swali 47 Ripoti
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
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Swali 49 Ripoti
Which of the following is NOT a true statement of the kinetic Theory of Gases?
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