JAMB UTME - Chemistry - 1978
Ibeere 1 Ìròyìn
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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Ibeere 3 Ìròyìn
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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Ibeere 4 Ìròyìn
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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Ibeere 7 Ìròyìn
The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;
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Ibeere 8 Ìròyìn
The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore
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Ibeere 9 Ìròyìn
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
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Ibeere 10 Ìròyìn
Which of the following is not a member of the homologous series of the paraffins (alkanes)?
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Ibeere 11 Ìròyìn
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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Ibeere 12 Ìròyìn
When each of the nitrates of Potassium, Magnesium and iron is heated,
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Ibeere 14 Ìròyìn
Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. The only ion which behaves as an oxidising agent is
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Ibeere 15 Ìròyìn
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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Ibeere 16 Ìròyìn
An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the
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Ibeere 17 Ìròyìn
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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Ibeere 18 Ìròyìn
In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?
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Ibeere 19 Ìròyìn
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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Ibeere 21 Ìròyìn
When heat is absorbed during a chemical reaction, the reaction is said to be
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Ibeere 22 Ìròyìn
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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Ibeere 23 Ìròyìn
The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;
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Ibeere 25 Ìròyìn
Which of the following metals cannot replace hydrogen from water or steam?
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Ibeere 26 Ìròyìn
Which of the following compounds will form a solution if exposed to air?
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Ibeere 27 Ìròyìn
Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?
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Ibeere 28 Ìròyìn
Which of the following gases may not be dried with concentrated sulphuric acid?
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Ibeere 29 Ìròyìn
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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Ibeere 30 Ìròyìn
The periodic classification of elements is an arrangement of the elements in order of their
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Ibeere 31 Ìròyìn
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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Ibeere 32 Ìròyìn
The most common type of chemical reaction which alkanes undergo is
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Ibeere 33 Ìròyìn
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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Ibeere 34 Ìròyìn
Which of the following reactions does not take place in the smelting of iron in a blast furnace?
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Ibeere 35 Ìròyìn
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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Ibeere 37 Ìròyìn
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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Ibeere 39 Ìròyìn
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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Ibeere 41 Ìròyìn
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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Ibeere 42 Ìròyìn
When sodium chloride and metallic sodium are each dissolved in water
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Ibeere 43 Ìròyìn
Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,
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Ibeere 44 Ìròyìn
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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Ibeere 46 Ìròyìn
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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Ibeere 47 Ìròyìn
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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Ibeere 48 Ìròyìn
During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,
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