JAMB UTME - Chemistry - 1980
Swali 1 Ripoti
The boiling point of water is higher than that of methanol because?
Maelezo ya Majibu
Swali 4 Ripoti
Which of the following derivatives of nitrogen affords an aqueous solution having a pH of less that 7?
Maelezo ya Majibu
Swali 5 Ripoti
Which of the following compounds will take up the molecules of bromine?
Maelezo ya Majibu
Swali 6 Ripoti
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)
Maelezo ya Majibu
Swali 8 Ripoti
Which of the following is acceptable as the organic product of the reaction of ethanoic acid and ethanol with an acid catalyst?
Maelezo ya Majibu
Swali 9 Ripoti
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?
Maelezo ya Majibu
Swali 10 Ripoti
Which of the following silver halides is readily soluble in ammonium hydroxide?
Maelezo ya Majibu
Swali 12 Ripoti
20 cm3 of 1 M H\(_2\)SO\(_4\) is mixed 20 cm\(^3\) of 1 M NaOH. The resulting solution is?
Maelezo ya Majibu
Swali 13 Ripoti
Which of the following is the correct order in the above diagram increasing boiling point, of the isomeric \(C_{5}H_{12}\) compounds?
Maelezo ya Majibu
Swali 14 Ripoti
Copper sulphate solution was electrolysed using the apparatus show above. Which of the following changes are observed?
Maelezo ya Majibu
Swali 15 Ripoti
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?
Maelezo ya Majibu
Swali 16 Ripoti
Which of the following classes of organic compounds undergoes rapid oxidation with bromine water?
Maelezo ya Majibu
Swali 17 Ripoti
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?
Maelezo ya Majibu
Swali 18 Ripoti
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
Maelezo ya Majibu
Swali 19 Ripoti
Detergents are more advantageous than soaps in hard water districts because
Maelezo ya Majibu
Swali 20 Ripoti
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?
Maelezo ya Majibu
Swali 23 Ripoti
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?
Maelezo ya Majibu
Swali 24 Ripoti
The chemical reaction which takes place at the anode (positive electrode) in electrolysis is?
Maelezo ya Majibu
Swali 25 Ripoti
Which of the following tests would confirm-unequivocally that a solution X contain the sulphate ion if it gives with
Maelezo ya Majibu
Swali 26 Ripoti
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?
Maelezo ya Majibu
Swali 27 Ripoti
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?
Maelezo ya Majibu
Swali 28 Ripoti
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?
Maelezo ya Majibu
Swali 31 Ripoti
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?
Maelezo ya Majibu
Swali 32 Ripoti
When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?
Maelezo ya Majibu
Swali 33 Ripoti
In which of the following is the oxidation state of oxygen different from its value in water?
Maelezo ya Majibu
Swali 35 Ripoti
Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate?
Maelezo ya Majibu
Swali 37 Ripoti
The alloy duralumin is used for the building of aeroplanes because it?
Maelezo ya Majibu
Swali 38 Ripoti
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?
Maelezo ya Majibu
Swali 39 Ripoti
When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called?
Maelezo ya Majibu
Swali 40 Ripoti
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.
Maelezo ya Majibu
Swali 41 Ripoti
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?
Maelezo ya Majibu
Swali 42 Ripoti
Under high pressure, real gases do not obey gas laws because their molecules?
Maelezo ya Majibu
Swali 43 Ripoti
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.
Maelezo ya Majibu
Swali 44 Ripoti
Which of the following statements is an exception in the assumptions of the kinetic theory of gases?
Maelezo ya Majibu
Swali 45 Ripoti
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
Maelezo ya Majibu
