JAMB UTME - Chemistry - 1981
Pregunta 2 Informe
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?
Detalles de la respuesta
Pregunta 3 Informe
In the preparation of ammonia, which of the following is used as the drying agent?
Detalles de la respuesta
Pregunta 5 Informe
In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
Detalles de la respuesta
Pregunta 6 Informe
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?
Detalles de la respuesta
Pregunta 8 Informe
Which of the following is NOT a true statement of the kinetic Theory of Gases?
Detalles de la respuesta
Pregunta 9 Informe
In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?
Detalles de la respuesta
Pregunta 10 Informe
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?
Detalles de la respuesta
Pregunta 12 Informe
28.8 cm3 of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?
Detalles de la respuesta
Pregunta 13 Informe
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?
Detalles de la respuesta
Pregunta 14 Informe
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?
Detalles de la respuesta
Pregunta 15 Informe
In the reaction
C + 2HNO3 → CO2 + NO2 + NO + H2O nitric acid is acting as?
Detalles de la respuesta
Pregunta 16 Informe
Which of the following compounds and elements would sublime on exposure to the atmosphere?
Detalles de la respuesta
Pregunta 17 Informe
Which of the following statements is NOT true of electrovalent compounds?
Detalles de la respuesta
Pregunta 19 Informe
The scale formation in a kinetic used for boiling water is caused by the presence in water of?
Detalles de la respuesta
Pregunta 21 Informe
Which one of the following metals is not normally extracted by chemical reduction because of its position in the electrochemical series?
Detalles de la respuesta
Pregunta 22 Informe
Which of the following represents a precipitation reaction?
Detalles de la respuesta
Pregunta 23 Informe
The general formula of an alkyl halide (which represent the halide) is?
Detalles de la respuesta
Pregunta 24 Informe
When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
Detalles de la respuesta
Pregunta 25 Informe
If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)
Detalles de la respuesta
Pregunta 28 Informe
When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
Detalles de la respuesta
Pregunta 29 Informe
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)
Detalles de la respuesta
Pregunta 31 Informe
the number of atoms in one mole of a substance is equal to?
Detalles de la respuesta
Pregunta 32 Informe
Which of the following statements about phosphorus is NOT correct?
Detalles de la respuesta
Pregunta 33 Informe
When sodium nitrate dissolves in water, ∆H is positive. This means that?
Detalles de la respuesta
Pregunta 34 Informe
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 ?
Detalles de la respuesta
Pregunta 38 Informe
Which of the following processes takes place during electrolysis?
Detalles de la respuesta
Pregunta 39 Informe
If an organic compound decolorizes bromine water then the compound is?
Detalles de la respuesta
Pregunta 40 Informe
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?
Detalles de la respuesta
Pregunta 41 Informe
Sodium and potassium belong to the same group of the Periodic Table. This is because?
Detalles de la respuesta
Pregunta 43 Informe
What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?
Detalles de la respuesta
Pregunta 44 Informe
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)
Detalles de la respuesta
Pregunta 45 Informe
What mass of sodium carbonate solution is in 500 cm3 of 0.1 molar sodium carbonate solution?
(Na = 23, C = 12, O = 16)
Detalles de la respuesta
Pregunta 46 Informe
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)
Detalles de la respuesta
Pregunta 47 Informe
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
Detalles de la respuesta
Pregunta 48 Informe
An element X has 127 neutrons and 82 electrons.
Its atomic number is?
Detalles de la respuesta
Pregunta 49 Informe
The brown coloration in nitric acid prepared in the laboratory can be removed by?
Detalles de la respuesta
