JAMB UTME - Chemistry - 1988
Ibeere 2 Ìròyìn
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
Ibeere 5 Ìròyìn
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
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Ibeere 7 Ìròyìn
The molar ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air because?
Ibeere 13 Ìròyìn
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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Ibeere 15 Ìròyìn
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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Ibeere 16 Ìròyìn
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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Ibeere 17 Ìròyìn
The acidic hydrogen in the compound is the hydrogen attached to carbon number
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Ibeere 18 Ìròyìn
The energy changes accompanying the addition of an electron to a gaseous atom is called?
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Ibeere 19 Ìròyìn
A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?
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Ibeere 20 Ìròyìn
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
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Ibeere 21 Ìròyìn
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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Ibeere 22 Ìròyìn
Which of the following physical properties decreases across the Periodic Table?
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Ibeere 23 Ìròyìn
Which of the following acts as both a reducing and an oxidizing agent?
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Ibeere 24 Ìròyìn
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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Ibeere 25 Ìròyìn
An increase in temperature causes an increase in the pressure of a gas because there is an increase in the?
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Ibeere 28 Ìròyìn
The formula of a compound formed in a reaction between a trivalent metal M and a tetravalent non-metal X is~?
Ibeere 29 Ìròyìn
The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by
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Ibeere 30 Ìròyìn
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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Ibeere 31 Ìròyìn
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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Ibeere 32 Ìròyìn
Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?
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Ibeere 35 Ìròyìn
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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Ibeere 36 Ìròyìn
Which property of a reversible reaction is affected by a catalyst?
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Ibeere 37 Ìròyìn
The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?
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Ibeere 40 Ìròyìn
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.
Ibeere 41 Ìròyìn
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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Ibeere 42 Ìròyìn
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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Ibeere 43 Ìròyìn
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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Ibeere 44 Ìròyìn
What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
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