JAMB UTME - Chemistry - 1981
Question 1 Rapport
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)
Détails de la réponse
Question 2 Rapport
Which of the following represents a precipitation reaction?
Détails de la réponse
Question 5 Rapport
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?
Détails de la réponse
Question 6 Rapport
An element X has 127 neutrons and 82 electrons.
Its atomic number is?
Détails de la réponse
Question 7 Rapport
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
Détails de la réponse
Question 8 Rapport
Which of the following processes takes place during electrolysis?
Détails de la réponse
Question 9 Rapport
If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)
Détails de la réponse
Question 10 Rapport
If an organic compound decolorizes bromine water then the compound is?
Détails de la réponse
Question 11 Rapport
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?
Détails de la réponse
Question 13 Rapport
When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
Détails de la réponse
Question 14 Rapport
In the preparation of ammonia, which of the following is used as the drying agent?
Détails de la réponse
Question 16 Rapport
the number of atoms in one mole of a substance is equal to?
Détails de la réponse
Question 18 Rapport
In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
Détails de la réponse
Question 20 Rapport
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?
Détails de la réponse
Question 21 Rapport
The general formula of an alkyl halide (which represent the halide) is?
Détails de la réponse
Question 22 Rapport
Which of the following is NOT a true statement of the kinetic Theory of Gases?
Détails de la réponse
Question 25 Rapport
Which of the following compounds and elements would sublime on exposure to the atmosphere?
Détails de la réponse
Question 26 Rapport
When sodium nitrate dissolves in water, ∆H is positive. This means that?
Détails de la réponse
Question 27 Rapport
Which one of the following metals is not normally extracted by chemical reduction because of its position in the electrochemical series?
Détails de la réponse
Question 28 Rapport
What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?
Détails de la réponse
Question 29 Rapport
In the reaction
C + 2HNO3 → CO2 + NO2 + NO + H2O nitric acid is acting as?
Détails de la réponse
Question 30 Rapport
28.8 cm3 of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?
Détails de la réponse
Question 31 Rapport
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?
Détails de la réponse
Question 32 Rapport
In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?
Détails de la réponse
Question 33 Rapport
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)
Détails de la réponse
Question 34 Rapport
Which of the following statements about phosphorus is NOT correct?
Détails de la réponse
Question 35 Rapport
When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
Détails de la réponse
Question 36 Rapport
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?
Détails de la réponse
Question 37 Rapport
What mass of sodium carbonate solution is in 500 cm3 of 0.1 molar sodium carbonate solution?
(Na = 23, C = 12, O = 16)
Détails de la réponse
Question 41 Rapport
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?
Détails de la réponse
Question 43 Rapport
Which of the following statements is NOT true of electrovalent compounds?
Détails de la réponse
Question 44 Rapport
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 ?
Détails de la réponse
Question 46 Rapport
The brown coloration in nitric acid prepared in the laboratory can be removed by?
Détails de la réponse
Question 47 Rapport
Sodium and potassium belong to the same group of the Periodic Table. This is because?
Détails de la réponse
Question 48 Rapport
The scale formation in a kinetic used for boiling water is caused by the presence in water of?
Détails de la réponse
Question 49 Rapport
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)
Détails de la réponse
