JAMB UTME - Chemistry - 1978
Pregunta 1 Informe
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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Pregunta 2 Informe
By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and
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Pregunta 4 Informe
Which of the following reactions does not take place in the smelting of iron in a blast furnace?
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Pregunta 5 Informe
An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the
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Pregunta 6 Informe
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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Pregunta 7 Informe
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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Pregunta 8 Informe
In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?
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Pregunta 9 Informe
The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;
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Pregunta 10 Informe
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
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Pregunta 11 Informe
Which of the following metals cannot replace hydrogen from water or steam?
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Pregunta 12 Informe
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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Pregunta 13 Informe
The oxidation state of chlorine in potassium chlorate is
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Pregunta 14 Informe
When heat is absorbed during a chemical reaction, the reaction is said to be
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Pregunta 15 Informe
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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Pregunta 16 Informe
Which of the following compounds will form a solution if exposed to air?
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Pregunta 17 Informe
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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Pregunta 19 Informe
When sodium chloride and metallic sodium are each dissolved in water
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Pregunta 20 Informe
Which of the following gases may not be dried with concentrated sulphuric acid?
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Pregunta 21 Informe
When each of the nitrates of Potassium, Magnesium and iron is heated,
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Pregunta 22 Informe
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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Pregunta 24 Informe
The most common type of chemical reaction which alkanes undergo is
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Pregunta 25 Informe
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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Pregunta 26 Informe
The periodic classification of elements is an arrangement of the elements in order of their
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Pregunta 29 Informe
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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Pregunta 30 Informe
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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Pregunta 31 Informe
During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,
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Pregunta 32 Informe
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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Pregunta 34 Informe
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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Pregunta 35 Informe
Which of the following is not a member of the homologous series of the paraffins (alkanes)?
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Pregunta 36 Informe
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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Pregunta 37 Informe
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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Pregunta 38 Informe
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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Pregunta 39 Informe
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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Pregunta 40 Informe
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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Pregunta 41 Informe
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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Pregunta 42 Informe
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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Pregunta 43 Informe
The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore
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Pregunta 44 Informe
Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?
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Pregunta 45 Informe
Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. The only ion which behaves as an oxidising agent is
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Pregunta 46 Informe
Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,
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Pregunta 47 Informe
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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Pregunta 48 Informe
The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;
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