JAMB UTME - Chemistry - 1980
Frage 1 Bericht
A cold aqueous solution of sodium chloride is electrolyzed using a graphite anode and an iron cathode. In the course of the electrolysis the electrolyte is continuously stirred. The liquid left after electrolysis will therefore consist of?
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Frage 3 Bericht
Which of the following compounds will take up the molecules of bromine?
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Frage 4 Bericht
A mixture of ethanol, sodium dichromate, and water is allowed to drop gradually into a boiling solution containing one part concentrated H2SO
4 and the liberate gas is collected by cooling it with ice water to give a liquid. This liquid is?
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Frage 5 Bericht
Which of the following derivatives of nitrogen affords an aqueous solution having a pH of less that 7?
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Frage 6 Bericht
Which of the following is acceptable as the organic product of the reaction of ethanoic acid and ethanol with an acid catalyst?
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Frage 7 Bericht
An endothermic reaction is one during which heat is.....and can be represented by the symbol.... which of the following combinations can be used accurately to complete the above definition?
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Frage 8 Bericht
When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?
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Frage 9 Bericht
The chemical reaction which takes place at the anode (positive electrode) in electrolysis is?
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Frage 10 Bericht
How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm3 of 6M HCl?
(Mg=24, H=1, Cl=35.5)
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Frage 11 Bericht
Given the mean atomic mass of chlorine prepared in the laboratory to be 35.5 and assuming that chlorine contains two isotopes of mass number 35 nad 37, what is the percentage composition of the isotope of mass number 35?
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Frage 12 Bericht
Cellulose and starches can be classified as one of the following?
Frage 13 Bericht
The following graph demonstrates the rate of reaction between calcium carbonate (marble)and dilute hydrochloric acid. The graph shows that the rate of reaction is initially greatest when
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Frage 14 Bericht
20 cm3 of 1 M H\(_2\)SO\(_4\) is mixed 20 cm\(^3\) of 1 M NaOH. The resulting solution is?
Frage 15 Bericht
Detergents are more advantageous than soaps in hard water districts because
Frage 16 Bericht
Copper sulphate solution was electrolysed using the apparatus show above. Which of the following changes are observed?
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Frage 17 Bericht
Which of the following tests would confirm-unequivocally that a solution X contain the sulphate ion if it gives with
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Frage 18 Bericht
In an attempt to remove sugar from a breaker containing a quantity of sand and sugar, 2 M ammonium chloride solution was accidentally added instead of water. Which of the following method could be used to remove the ammonium chloride from the mixture?
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Frage 19 Bericht
The IUPAC name for the compound is
Frage 20 Bericht
Which of the following classes of organic compounds undergoes rapid oxidation with bromine water?
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Frage 22 Bericht
Under high pressure, real gases do not obey gas laws because their molecules?
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Frage 25 Bericht
On heating, under suitable conditions, 1 litres of monoatomic gas,X, combines with 11/2 litres of an oxide, What is the formula of the oxide.
Frage 27 Bericht
In which of the following is the oxidation state of oxygen different from its value in water?
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Frage 28 Bericht
If one of the following oxides is heated with hydrogen or carbon using a bunsen burner, it is not reduced to the metal. Which one is it?
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Frage 30 Bericht
A solution X on mixing with AgNO3 solution, gives a white precipitate solution in NH3. A Solution Y, when added to X, also gives a white precipiate which is soluble on boiling. Solution Y contains?
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Frage 31 Bericht
A sample of an oxide of mercury weighed 1.00g. When this was heated, oxygen was given off, and 1.00g of mercury metal only was left. What is the formula of the oxide?
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Frage 32 Bericht
Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate?
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Frage 33 Bericht
If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litre of water,and resulting solution mixed thoroughly, the resulting sulpuric acid concentration will be?
Frage 34 Bericht
When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called?
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Frage 35 Bericht
When copper (ii) sulphate solution is treated with excess ammonium hydroxide, a precipitate is first formed, and then this dissolves to give a deep blue solution. This deep blue solution is a
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Frage 36 Bericht
Element X has a total of 19 electrons and can react with oxygen to form an oxide. Which of the following statements is NOT true of the oxide of the element?
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Frage 38 Bericht
Which of the following is the correct order in the above diagram increasing boiling point, of the isomeric \(C_{5}H_{12}\) compounds?
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Frage 39 Bericht
The boiling point of water is higher than that of methanol because?
Frage 40 Bericht
The following arrangement of elements in order of decreasing number of outer electrons; One of the elements is wrongly placed. Which is it? ALUMINIUM, CHLORINE, SILICON, MAGNESIUM AND SODIUM.
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Frage 41 Bericht
Which of the following statements is an exception in the assumptions of the kinetic theory of gases?
Frage 42 Bericht
The alloy duralumin is used for the building of aeroplanes because it?
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Frage 43 Bericht
10cm3 of CO is mixed and sparked with 100cm3 of air containing 21% O2. If all the volumes measured at S.T.P. the volume of resulting gases would be?
Frage 46 Bericht
Which of the following silver halides is readily soluble in ammonium hydroxide?
