JAMB UTME - Chemistry - 1981
Frage 3 Bericht
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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Frage 4 Bericht
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?
Frage 5 Bericht
Which of the following statements is NOT true of electrovalent compounds?
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Frage 7 Bericht
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
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Frage 8 Bericht
If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)
Frage 9 Bericht
In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?
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Frage 10 Bericht
In the preparation of ammonia, which of the following is used as the drying agent?
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Frage 11 Bericht
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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Frage 12 Bericht
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?
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Frage 13 Bericht
The general formula of an alkyl halide (which represent the halide) is?
Frage 14 Bericht
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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Frage 15 Bericht
The scale formation in a kinetic used for boiling water is caused by the presence in water of?
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Frage 16 Bericht
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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Frage 17 Bericht
When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
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Frage 18 Bericht
Which of the following compounds and elements would sublime on exposure to the atmosphere?
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Frage 19 Bericht
An element X has 127 neutrons and 82 electrons.
Its atomic number is?
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Frage 20 Bericht
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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Frage 21 Bericht
The IUPAC name for
Frage 22 Bericht
What mass of sodium carbonate solution is in 500 cm3 of 0.1 molar sodium carbonate solution?
(Na = 23, C = 12, O = 16)
Frage 23 Bericht
28.8 cm3 of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?
Frage 24 Bericht
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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Frage 25 Bericht
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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Frage 29 Bericht
When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
Frage 31 Bericht
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)
Frage 32 Bericht
Sodium and potassium belong to the same group of the Periodic Table. This is because?
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Frage 34 Bericht
In the reaction
C + 2HNO3 → CO2 + NO2 + NO + H2O nitric acid is acting as?
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Frage 35 Bericht
The brown coloration in nitric acid prepared in the laboratory can be removed by?
Frage 38 Bericht
A polymerization reaction is one in which?
Frage 40 Bericht
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?
Frage 42 Bericht
What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?
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Frage 44 Bericht
An efflorescent compound is a substance that?
Frage 45 Bericht
If an organic compound decolorizes bromine water then the compound is?
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Frage 46 Bericht
When sodium nitrate dissolves in water, ∆H is positive. This means that?
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Frage 48 Bericht
In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
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Frage 49 Bericht
Which of the following is NOT a true statement of the kinetic Theory of Gases?
