JAMB UTME - Chemistry - 1988
Frage 1 Bericht
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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Frage 2 Bericht
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
Frage 3 Bericht
Detergents have the general formula?
Frage 4 Bericht
Which of the following in aqueous solution is neutral to litmus?
Frage 6 Bericht
Suitable reagents for the laboratory preparation nitrogen are?
Frage 7 Bericht
Which property of a reversible reaction is affected by a catalyst?
Frage 9 Bericht
What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
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Frage 10 Bericht
Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?
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Frage 11 Bericht
What are the possible oxidation numbers of an element if its atomic number is 17?
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17 = 2, 8, 7
Frage 12 Bericht
The acidic hydrogen in the compound is the hydrogen attached to carbon number
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Frage 13 Bericht
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.
Frage 14 Bericht
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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Frage 17 Bericht
Which of the following physical properties decreases across the Periodic Table?
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Frage 18 Bericht
Which of the following acts as both a reducing and an oxidizing agent?
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Frage 19 Bericht
Which of the following substances is a basic salt?
Frage 21 Bericht
The formula of a compound formed in a reaction between a trivalent metal M and a tetravalent non-metal X is~?
Frage 22 Bericht
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?
Frage 23 Bericht
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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Frage 24 Bericht
The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?
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Frage 29 Bericht
The energy changes accompanying the addition of an electron to a gaseous atom is called?
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Frage 30 Bericht
The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by
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Frage 31 Bericht
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
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Frage 32 Bericht
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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Frage 33 Bericht
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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Frage 34 Bericht
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
Frage 35 Bericht
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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Frage 36 Bericht
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)?
Frage 37 Bericht
The IUPAC name for
Frage 38 Bericht
An increase in temperature causes an increase in the pressure of a gas because there is an increase in the?
Frage 39 Bericht
What volume of a 0.1 M H3PO4 will be required to neutralize 45.0 cm3 of a 0.2 M NaOH?
Frage 40 Bericht
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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Frage 41 Bericht
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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Frage 42 Bericht
The molar ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air because?
Frage 43 Bericht
A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?
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Frage 45 Bericht
Methylethanoate reacts with ammonia to yield?
