JAMB UTME - Chemistry - 1978
Pergunta 1 Relatório
A small quantity of solid ammonium chloride (NH4Cl) was heated gently in a test tube, the solid gradually disappears to produce two gases. Later, a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone
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Pergunta 3 Relatório
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
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Pergunta 4 Relatório
During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,
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Pergunta 5 Relatório
An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the
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Pergunta 6 Relatório
In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?
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Pergunta 7 Relatório
The most common type of chemical reaction which alkanes undergo is
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Pergunta 8 Relatório
If 30cm3 of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm3 of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?
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Pergunta 9 Relatório
When sodium chloride and metallic sodium are each dissolved in water
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Pergunta 11 Relatório
Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. The only ion which behaves as an oxidising agent is
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Pergunta 13 Relatório
The periodic classification of elements is an arrangement of the elements in order of their
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Pergunta 14 Relatório
If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is
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Pergunta 15 Relatório
Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?
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Pergunta 16 Relatório
Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?
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Pergunta 17 Relatório
Which of the five atoms can be described by the following properties: Relative atomic mass is greater than 30 but less than 40, it has odd atomic number and forms a unipositive ion in solution?
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Pergunta 19 Relatório
In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?
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Pergunta 20 Relatório
The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore
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Pergunta 21 Relatório
When heat is absorbed during a chemical reaction, the reaction is said to be
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Pergunta 22 Relatório
The size (diameter) of five elements are in the order R < T < W < X < Y, Y being the largest. If each atom has an electron situated on its circumference, and neglecting other factors, which of the atoms will lose its electron most reluctantly?
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Pergunta 23 Relatório
If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because
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Pergunta 24 Relatório
When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as
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Pergunta 25 Relatório
Which of the following metals cannot replace hydrogen from water or steam?
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Pergunta 26 Relatório
By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and
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Pergunta 27 Relatório
The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;
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Pergunta 28 Relatório
Which of the following compounds will form a solution if exposed to air?
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Pergunta 29 Relatório
When each of the nitrates of Potassium, Magnesium and iron is heated,
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Pergunta 30 Relatório
Consider the following exothermic reaction
2SO2(g) + O2(g) ↔ 2SO3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then
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Pergunta 31 Relatório
A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by
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Pergunta 32 Relatório
A gas jar was inverted over burning yellow phosphorus floating over water in a beaker. After burning, the water level was found to rise in the gas jar. The water level rises because
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Pergunta 33 Relatório
The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;
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Pergunta 34 Relatório
When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are;
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Pergunta 35 Relatório
Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of
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Pergunta 37 Relatório
Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,
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Pergunta 39 Relatório
A solid X when heated gives off a brown gas. If X is soluble in excess sodium hydroxide solution but insoluble in excess ammonium hydroxide solution, then X is
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Pergunta 40 Relatório
Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by
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Pergunta 41 Relatório
An experiment test of the Law of conservation of Mass is illustrated in the diagram. In practice, the flask is weighed before and after reaction between solutions X and Y. Which of the following pairs of solutions will be unsuitable for the experiments
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Pergunta 42 Relatório
Which of the following is not a member of the homologous series of the paraffins (alkanes)?
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Pergunta 43 Relatório
You are provided with five gas jars containing SO2, CO2, H2, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely
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Pergunta 44 Relatório
Which of the following reactions does not take place in the smelting of iron in a blast furnace?
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Pergunta 46 Relatório
Which of the following gases may not be dried with concentrated sulphuric acid?
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Pergunta 47 Relatório
Consider the solubility curves of three salts X, Y and Z given in the diagram. If each solution of the salt contains 200 g, and is heated to 100oC, which solution or solutions will deposit 100 g of the solute when suddenly cooled to 0oC?
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Pergunta 48 Relatório
Five compounds R,T,W,X and Y form the following compounds: a basic hydride R.H, an acidic hydride YH, atmospheric oxide W2O3, XO2. which of the elements is an alkali
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