JAMB UTME - Chemistry - 1978
Question 1 Report
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
Question 2 Report
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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Question 4 Report
Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?
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Question 5 Report
The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;
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The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively acetic acid and ethene. Acetic acid is a carboxylic acid with the formula CH3COOH, while ethene is an unsaturated hydrocarbon with the formula CH2=CH2. The IUPAC naming system is a set of rules used to give unique names to organic compounds based on their molecular structure. In this case, the IUPAC name of CH3COOH is derived from the parent alkane, which is methane (CH4). Replacing one hydrogen atom in methane with a methyl group (CH3) results in the parent chain for acetic acid, which is ethane (C2H6). The carboxyl group (-COOH) attached to the second carbon atom in the chain gives the compound its name, ethanoic acid. Similarly, the IUPAC name of CH2=CH2 is ethene, which is derived from the parent alkane, ethane, by removing one hydrogen atom from each of the two carbon atoms that form a double bond.
Question 6 Report
Which of the following reactions does not take place in the smelting of iron in a blast furnace?
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Question 7 Report
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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Question 8 Report
The periodic classification of elements is an arrangement of the elements in order of their
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Question 9 Report
When sodium chloride and metallic sodium are each dissolved in water
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Question 10 Report
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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Question 11 Report
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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Question 12 Report
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
Question 13 Report
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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Question 14 Report
Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?
Question 15 Report
Which of the following metals cannot replace hydrogen from water or steam?
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Question 16 Report
When each of the nitrates of Potassium, Magnesium and iron is heated,
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Question 17 Report
The normal boiling point of a liquid is defined as
Question 18 Report
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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Question 19 Report
An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the
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Question 20 Report
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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Question 21 Report
Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. The only ion which behaves as an oxidising agent is
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Question 22 Report
The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;
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Question 23 Report
Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,
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Question 24 Report
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?
Question 25 Report
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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Question 26 Report
When heat is absorbed during a chemical reaction, the reaction is said to be
Question 27 Report
Which of the following compounds will form a solution if exposed to air?
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Question 28 Report
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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Question 29 Report
During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,
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Question 30 Report
The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore
Question 31 Report
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
Question 32 Report
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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Question 34 Report
Zinc Oxide is a
Question 36 Report
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
Question 38 Report
Which of the following gases may not be dried with concentrated sulphuric acid?
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Question 39 Report
The most common type of chemical reaction which alkanes undergo is
Question 40 Report
By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and
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Question 41 Report
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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Question 42 Report
When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as
Question 43 Report
Which of the following is not a member of the homologous series of the paraffins (alkanes)?
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Question 44 Report
In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?
Question 45 Report
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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Question 47 Report
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
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Question 48 Report
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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