JAMB UTME - Chemistry - 1988
Vraag 2 Verslag
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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Vraag 5 Verslag
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
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Vraag 7 Verslag
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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Vraag 8 Verslag
Which of the following physical properties decreases across the Periodic Table?
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Vraag 9 Verslag
The acidic hydrogen in the compound is the hydrogen attached to carbon number
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Vraag 10 Verslag
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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Vraag 11 Verslag
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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Vraag 13 Verslag
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.
Vraag 14 Verslag
The molar ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air because?
Vraag 15 Verslag
The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?
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Vraag 16 Verslag
Methylethanoate reacts with ammonia to yield?
Vraag 17 Verslag
Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?
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Vraag 18 Verslag
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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Vraag 19 Verslag
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
Vraag 21 Verslag
In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of
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Vraag 23 Verslag
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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Vraag 24 Verslag
The formula of a compound formed in a reaction between a trivalent metal M and a tetravalent non-metal X is~?
Vraag 26 Verslag
The energy changes accompanying the addition of an electron to a gaseous atom is called?
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Vraag 27 Verslag
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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Vraag 28 Verslag
An increase in temperature causes an increase in the pressure of a gas because there is an increase in the?
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Vraag 29 Verslag
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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Vraag 31 Verslag
The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by
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Vraag 32 Verslag
What are the possible oxidation numbers of an element if its atomic number is 17?
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17 = 2, 8, 7
Vraag 33 Verslag
A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?
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Vraag 34 Verslag
Detergents have the general formula?
Vraag 35 Verslag
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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Vraag 37 Verslag
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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Vraag 38 Verslag
What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
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Vraag 42 Verslag
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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Vraag 43 Verslag
The IUPAC name for
Vraag 44 Verslag
Which of the following acts as both a reducing and an oxidizing agent?
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