JAMB UTME - Chemistry - 1988
Pregunta 1 Informe
What are the possible oxidation numbers of an element if its atomic number is 17?
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17 = 2, 8, 7
Pregunta 3 Informe
An increase in temperature causes an increase in the pressure of a gas because there is an increase in the?
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Pregunta 4 Informe
Which property of a reversible reaction is affected by a catalyst?
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Pregunta 5 Informe
Which of the following compounds has the highest boiling point?
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Pregunta 6 Informe
The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?
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Pregunta 7 Informe
Which of the following dilute solutions has the lowest pH value?
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Pregunta 8 Informe
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
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Pregunta 9 Informe
Which of the following in aqueous solution is neutral to litmus?
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Pregunta 10 Informe
Alkanoates are formed by the reaction of alkanoic acid with?
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Pregunta 11 Informe
Use the graph above to answer this question. The mass of a substance, M, liberated at an electrode during electrolysis is proportional to the quantity of electricity, Q passing through the electrolyte. This is represented graphically by.
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Pregunta 12 Informe
What volume of a 0.1 M H3PO4 will be required to neutralize 45.0 cm3 of a 0.2 M NaOH?
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Pregunta 13 Informe
Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na2S2O3(aq) + 2HCl(aq) → 2NaCI(aq) + H2O(I) + SO2(g) + S(g)?
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Pregunta 14 Informe
One mole of propane is mixed with five moles of oxygen. The mixture is ignited and the propane burns completely. What is the volume of the products at s.t.p?(G.M.V = 22.4 dm3 mol-1)
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C3H8 + 5O2 → 3CO2 + 4H2O
When the mixture is ignited CO2 is collected as product. From the equation 33 moles of CO2 is produced which equals 3 x 2.4 dm3 = 67.2 dm3 at S.T.P
Pregunta 15 Informe
Which of the following acts as both a reducing and an oxidizing agent?
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Pregunta 16 Informe
When H2S gas is passed into a solution of iron (III) chloride, the colour changes from yellow to green. This is because?
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Pregunta 17 Informe
The formula of a compound formed in a reaction between a trivalent metal M and a tetravalent non-metal X is~?
Pregunta 18 Informe
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
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Pregunta 19 Informe
Which of the following statements is NOT correct?
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Increasing the pressure confines the gas molecules to a smaller space, thereby reducing the volume. Reducing the pressure the other way round increases the volume of a gas.
Pregunta 20 Informe
Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?
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Pregunta 21 Informe
The ion that may be assumed to have negligible concentration in a sample of water that lathers readily with soap is?
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Pregunta 22 Informe
Suitable reagents for the laboratory preparation nitrogen are?
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Pregunta 23 Informe
2.25g of a sample of an oxide of copper on reduction gave 2.0g of copper. 2.50g of another oxide of copper on reduction also gave 2.0g of copper. These results are in accordance with the law of?
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Pregunta 24 Informe
A mixture of starch solution and potassium iodide was placed in a test tube. On adding dilute tetraoxosulphate (lV) acid and then K2Cr2O7 solutions, a blue-black colour was produced. In this reaction, the?
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Pregunta 25 Informe
Carbon (ll) oxide may be collected as shown above because it
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Pregunta 26 Informe
A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?
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Pregunta 30 Informe
A substance S is isomorphous with another substance R. When a tiny crystals of S is added into a supersaturated solution of R?
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Pregunta 32 Informe
The molar ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air because?
Pregunta 33 Informe
Given the reactions (i) Fe(s) + X(NO3)2(aq) → Fe(NO3) + X(s) (ii) H2(g) + XO → X + H2O(s); X is likely to be?
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Pregunta 34 Informe
The energy changes accompanying the addition of an electron to a gaseous atom is called?
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Pregunta 36 Informe
The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by
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Pregunta 38 Informe
Crude copper can be purified by the electrolysis of CuSO4(aq) if?
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Pregunta 39 Informe
The acidic hydrogen in the compound is the hydrogen attached to carbon number
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Pregunta 41 Informe
Which of the following physical properties decreases across the Periodic Table?
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Pregunta 42 Informe
The forces holding naphthalene crystals together can be overcome when naphthalene is heated to a temperature of 354K resulting in the crystal to melting. These forces are known as?
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Pregunta 43 Informe
An eruption pollution an environment with gas suspected to be H2S, a poisonous gas. A residue team should spray the environment with?
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Pregunta 45 Informe
What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
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