1998
All your burette readings (initial and final), as well as the size of your pipette, must be recorded but no account of experimental procedure is required. All calculations must be done in your answer book.A is a solution…
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1998 WAEC SSCE Chemistry Past Questions
1998
Credit will be given for strict adherence to instructions, for observations precisely recorded, and for accurate inferences. All tests, observations, and inferences must be clearly entered in your answer book, In ink, a…
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1998
(a) A soluble chloride X reacted with a liquid Y on heating, to give gas Z which turned moist blue litmus paper red and fumed in moist air.(i) Identity Y and Z (ii) Give one chemical test to confirm that X is a chloride(…
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1998
(a)(i) What is an electrolyte?(ii) Classify each of the following as strong electrolyte/weak, electrolyte/non-electrolyte. Potassium chloride; sodium ethanoate, aqueous ammonia; cane sugar(b)(i) Write half-cell equations…
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1998
(a)(i) Define heat of neutralization(ii) Give the reason why copper (II) chloride can be prepared by neutralization, unlike lead (II) chloride.(b)(i) Describe in outline, the manufacture of trioxonitrate (V) acid by the…
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1998
(a)(i) What type of reaction is involved in each of the conversion processes indicated as I to V below?(ii) Name one isomer of glucose(iii) Explain why palmwine becomes sour on prolonged exposure to air.(b)(i) List the r…
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1998
(a)(i) List the quantum number that are assigned to an electron in an atom.(ii) What is the maximum number of electrons that can occupy the 3d orbital?(b) An element represented as P has the following electronic configur…
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1998
(a) If a steel spoon were to be plated with silver, state what would be suitable for use as the;(i) anode. (ii) cathode; (iii) electrolyte(b)(i) Write an equation for one of the reactions involved in the purification of…
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1998
Xg of a pure sample of iron (II) sulphide reacted completely with excess dilute hydrochloric acid to give 3.20g of iron (II) chloride according to the following equation: FeS\(_{(s)}\) + 2HCI\(_{(aq)}\) ---> FeCl\(_{2…
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1998
(a) List two uses of sodium trioxocarbonate (IV).(b) Sodium trioxocarbonate (IV) solution is alkaline.(i) What phenomenon is responsible for this observation?(ii) Name the product obtained on passing carbon (IV) oxide in…
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1998
(a) Write an equation for the reaction of chlorine with(i) potassium iodide solution;(ii) zinc on heating(b) Identify the product Q in the following reaction: Cl\(_2\) + 2NaOH \(\to\) NaCl + H\(_2\)O + Q.
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1998
(a)(i) What is meant by the activation energy of a reaction?(ii) State the effect of a catalyst on activation energy.(b) What substance serves as a catalyst in each of the following?(I) Hydrogenation of oils(ii) Biochemi…
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1998
(a)(i) What is the general formula for alkanoic acids?(ii) State two chemical properties of ethanoic acid.(b) Which of propene, butane and pentane(i) will decolorize acidified KMnO\(_4\) solution?(ii) can be easily polym…
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1998
(a) What is the IUPAC name of Fe\(_2\)(SO\(_4\))\(_3\)?(b)(i) Write an equation to represent the reaction of hydrogen sulphide with iron (III) chloride solution.(ii) Mention one change observed during the reaction in (b)…
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1998
(a)(i) Arrange the following elements in the order of increasing reactivity. Iron, Lead, Magnessium, Aluminium.(ii) Which of the following elements in (a)(i) above reacts with sodium hydroxide to give hydrogen?(b) What p…
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1998
(a) State two postulates of the kinetic theory of gases.(b) Write two chemical properties that are common to both carbon (IV) oxide and sulphur (IV) oxide.
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1998
Copy and complete the following tableElementNumber of NeutronsElectronic ConfigurationGroup in the periodic Table\(^{23}_{11}Na\) ---1s\(^{2}\)2s\(^{2}\)2p\(^{6}\)3s\(^{1}\)1\(^4_2He\)2 ---- --- ----71s\(^{2}\)2s\(^{2}\…
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1998
The following oxides react with water except
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1998
AN AQUEOUS SOLUTION IS ACIDIC IF
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1998
Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?
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