JAMB UTME - Chemistry - 1981
Question 3 Report
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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Question 4 Report
An efflorescent compound is a substance that?
Question 5 Report
If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)
Question 7 Report
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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Question 9 Report
When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
Question 10 Report
Sodium and potassium belong to the same group of the Periodic Table. This is because?
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Question 12 Report
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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Question 13 Report
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
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Question 14 Report
When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
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Question 15 Report
The scale formation in a kinetic used for boiling water is caused by the presence in water of?
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Question 16 Report
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?
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Question 17 Report
The brown coloration in nitric acid prepared in the laboratory can be removed by?
Question 18 Report
What mass of sodium carbonate solution is in 500 cm3 of 0.1 molar sodium carbonate solution?
(Na = 23, C = 12, O = 16)
Question 19 Report
The general formula of an alkyl halide (which represent the halide) is?
Question 20 Report
28.8 cm3 of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?
Question 22 Report
In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
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Question 25 Report
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?
Question 26 Report
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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Question 27 Report
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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Question 28 Report
In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?
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Question 29 Report
Which of the following statements about phosphorus is NOT correct?
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Question 31 Report
In the reaction
C + 2HNO3 → CO2 + NO2 + NO + H2O nitric acid is acting as?
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Question 32 Report
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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Question 33 Report
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)
Question 34 Report
Which of the following is NOT a true statement of the kinetic Theory of Gases?
Question 35 Report
When sodium nitrate dissolves in water, ∆H is positive. This means that?
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Question 37 Report
If an organic compound decolorizes bromine water then the compound is?
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Question 39 Report
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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Question 40 Report
In the preparation of ammonia, which of the following is used as the drying agent?
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Question 41 Report
A polymerization reaction is one in which?
Question 42 Report
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?
Question 43 Report
What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?
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Question 44 Report
Which of the following statements is NOT true of electrovalent compounds?
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Question 45 Report
The IUPAC name for
Question 46 Report
Which of the following compounds and elements would sublime on exposure to the atmosphere?
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Question 48 Report
An element X has 127 neutrons and 82 electrons.
Its atomic number is?
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