JAMB UTME - Chemistry - 1978
Tambaya 1 Rahoto
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
Tambaya 3 Rahoto
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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Tambaya 5 Rahoto
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?
Tambaya 7 Rahoto
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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Tambaya 9 Rahoto
When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as
Tambaya 10 Rahoto
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?
Tambaya 11 Rahoto
The normal boiling point of a liquid is defined as
Tambaya 12 Rahoto
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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Tambaya 13 Rahoto
The most common type of chemical reaction which alkanes undergo is
Tambaya 14 Rahoto
When heat is absorbed during a chemical reaction, the reaction is said to be
Tambaya 15 Rahoto
The periodic classification of elements is an arrangement of the elements in order of their
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Tambaya 16 Rahoto
During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,
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Tambaya 17 Rahoto
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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Tambaya 20 Rahoto
Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. The only ion which behaves as an oxidising agent is
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Tambaya 21 Rahoto
Which of the following metals cannot replace hydrogen from water or steam?
Tambaya 23 Rahoto
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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Tambaya 24 Rahoto
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
Tambaya 25 Rahoto
The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore
Tambaya 26 Rahoto
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?
Tambaya 27 Rahoto
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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Tambaya 28 Rahoto
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
Tambaya 29 Rahoto
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
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Tambaya 30 Rahoto
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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Tambaya 31 Rahoto
Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?
Tambaya 32 Rahoto
The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;
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Tambaya 33 Rahoto
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
Tambaya 34 Rahoto
Which of the following gases may not be dried with concentrated sulphuric acid?
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Tambaya 35 Rahoto
In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?
Tambaya 36 Rahoto
An example of an alcohol is
Tambaya 37 Rahoto
Which of the following is not a member of the homologous series of the paraffins (alkanes)?
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Tambaya 39 Rahoto
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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Tambaya 40 Rahoto
Which of the following reactions does not take place in the smelting of iron in a blast furnace?
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Tambaya 41 Rahoto
When each of the nitrates of Potassium, Magnesium and iron is heated,
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Tambaya 42 Rahoto
Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?
Tambaya 43 Rahoto
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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Tambaya 44 Rahoto
The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;
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Tambaya 45 Rahoto
Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,
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Tambaya 46 Rahoto
An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the
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Tambaya 47 Rahoto
Zinc Oxide is a
Tambaya 48 Rahoto
Which of the following compounds will form a solution if exposed to air?
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