JAMB UTME - Chemistry - 1988
Question 1 Rapport
Alkanoates are formed by the reaction of alkanoic acid with?
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Question 2 Rapport
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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Question 4 Rapport
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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Question 5 Rapport
Which of the following acts as both a reducing and an oxidizing agent?
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Question 7 Rapport
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)
Détails de la réponse
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
Question 9 Rapport
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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Question 10 Rapport
Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?
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Question 11 Rapport
Which of the following physical properties decreases across the Periodic Table?
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Question 12 Rapport
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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Question 14 Rapport
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
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Question 15 Rapport
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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Question 17 Rapport
What are the possible oxidation numbers of an element if its atomic number is 17?
Détails de la réponse
17 = 2, 8, 7
Question 18 Rapport
The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?
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Question 19 Rapport
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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Question 20 Rapport
Which property of a reversible reaction is affected by a catalyst?
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Question 22 Rapport
The formula of a compound formed in a reaction between a trivalent metal M and a tetravalent non-metal X is~?
Question 23 Rapport
An increase in temperature causes an increase in the pressure of a gas because there is an increase in the?
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Question 24 Rapport
The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by
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Question 25 Rapport
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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Question 26 Rapport
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
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Question 27 Rapport
The molar ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air because?
Question 28 Rapport
Suitable reagents for the laboratory preparation nitrogen are?
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Question 29 Rapport
What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
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Question 30 Rapport
Which of the following compounds has the highest boiling point?
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Question 31 Rapport
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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Question 32 Rapport
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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Question 33 Rapport
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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Question 35 Rapport
The energy changes accompanying the addition of an electron to a gaseous atom is called?
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Question 37 Rapport
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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Question 39 Rapport
Which of the following in aqueous solution is neutral to litmus?
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Question 40 Rapport
Carbon (ll) oxide may be collected as shown above because it
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Question 41 Rapport
The acidic hydrogen in the compound is the hydrogen attached to carbon number
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Question 42 Rapport
A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?
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Question 43 Rapport
Crude copper can be purified by the electrolysis of CuSO4(aq) if?
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Question 44 Rapport
Which of the following dilute solutions has the lowest pH value?
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Question 45 Rapport
Which of the following statements is NOT correct?
Détails de la réponse
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.
