JAMB UTME - Chemistry - 1981
Vraag 1 Verslag
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?
Antwoorddetails
Vraag 3 Verslag
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?
Antwoorddetails
Vraag 4 Verslag
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)
Antwoorddetails
Vraag 5 Verslag
If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)
Antwoorddetails
Vraag 6 Verslag
The IUPAC name for
Vraag 7 Verslag
The brown coloration in nitric acid prepared in the laboratory can be removed by?
Antwoorddetails
Vraag 8 Verslag
Which one of the following metals is not normally extracted by chemical reduction because of its position in the electrochemical series?
Antwoorddetails
Vraag 9 Verslag
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)
Antwoorddetails
Vraag 10 Verslag
28.8 cm3 of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?
Antwoorddetails
Vraag 13 Verslag
When sodium nitrate dissolves in water, ∆H is positive. This means that?
Antwoorddetails
Vraag 14 Verslag
In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?
Antwoorddetails
Vraag 15 Verslag
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)
Antwoorddetails
Vraag 16 Verslag
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?
Antwoorddetails
Vraag 18 Verslag
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
Antwoorddetails
Vraag 19 Verslag
If an organic compound decolorizes bromine water then the compound is?
Antwoorddetails
Vraag 21 Verslag
Which of the following is NOT a true statement of the kinetic Theory of Gases?
Antwoorddetails
Vraag 22 Verslag
In the preparation of ammonia, which of the following is used as the drying agent?
Antwoorddetails
Vraag 23 Verslag
A polymerization reaction is one in which?
Vraag 24 Verslag
What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?
Antwoorddetails
Vraag 26 Verslag
Which of the following compounds and elements would sublime on exposure to the atmosphere?
Antwoorddetails
Vraag 28 Verslag
The scale formation in a kinetic used for boiling water is caused by the presence in water of?
Antwoorddetails
Vraag 29 Verslag
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?
Antwoorddetails
Vraag 30 Verslag
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?
Antwoorddetails
Vraag 31 Verslag
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?
Antwoorddetails
Vraag 32 Verslag
An element X has 127 neutrons and 82 electrons.
Its atomic number is?
Antwoorddetails
Vraag 33 Verslag
When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
Antwoorddetails
Vraag 34 Verslag
Sodium and potassium belong to the same group of the Periodic Table. This is because?
Antwoorddetails
Vraag 36 Verslag
What mass of sodium carbonate solution is in 500 cm3 of 0.1 molar sodium carbonate solution?
(Na = 23, C = 12, O = 16)
Antwoorddetails
Vraag 38 Verslag
In the reaction
C + 2HNO3 → CO2 + NO2 + NO + H2O nitric acid is acting as?
Antwoorddetails
Vraag 39 Verslag
When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
Antwoorddetails
Vraag 41 Verslag
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 ?
Antwoorddetails
Vraag 43 Verslag
Which of the following statements is NOT true of electrovalent compounds?
Antwoorddetails
Vraag 45 Verslag
The general formula of an alkyl halide (which represent the halide) is?
Vraag 49 Verslag
In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
Antwoorddetails
