1993
A solution containing 0.095 mol. dm\(^{-3}\) of trioxonitrate (V) acid. Solution B contains 13.50g of X\(_2\)CO\(_3\).10H\(_2\)O per dm\(^3\)(a) Put A in the burette and titrate with 20cm\(^3\) or 25cm\(^3\) portions of…
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1993 WAEC SSCE Chemistry Past Questions
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1993
You are provided with two aqueous solutions labelled C and D. Carry out the following exercises on them. Record your observations and identify any gases evolved. State the condition you draw from the result of each test.…
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1993
(a) State;(i) One advantage:(ii) One disadvantage of evaporation of salt solutions to dryness over crystallization.(b)(i) List two normal salts which when dissolved in pure water are acidic to litmus(ii) Mention the phen…
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1993
(a)(i) List four characteristic properties of transition metals(ii) Name two metals that can be extracted from their ore by electrolysis.(b)(i) Determine the oxidation number of chromium in Cr\(_2\)O\(^{2-}_{7}\)(ii) Sta…
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1993
(a)(i) What is meant by the rate of a chemical reaction?(ii) Explain in terms of the vision theory, the effect of temperature increase on reaction rate.(b) When hydrogen peroxide is exposed to air, it decomposes(i) Write…
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1993
(a)(i) Define the term polymerization.(ii) List the three conditions required for the polymerization on of ethene.(iii) State the property which is common to compounds that can be easily polymerized(b) Write appropriate…
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1993
(a)(i) Distinguish between a strong acid and a concentrated acid.(ii) What is meant by amphoteric oxide? Give one example.(b)(i) Describe the manufacture of tetraoxosulphate (VI) acid by contact process.(ii) Write one eq…
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1993
The compound whose formula is written below is a major component of a soft fatty substance:(a) State the change that would be observed in the physical state of the fatty substance if hydrogen were bubbled through it for…
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1993
(a) X and Y belong to the same period in the Periodic Table is a group I element while Y belongs to group VII. State which of the elements would(i) be a good oxidizing agent(ii) have the smaller atomic volume(iii) have t…
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1993
State which of the following can exhibit geometric isomerism:Give reason for your answer
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1993
Mention the respective properties of the following allotropes of carbon that account for their uses as indicated:(a) diamond used for drilling rocks;(b) diamond used as jewels;(c) graphite used as electrodes;(d) graphit…
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1993
(a) Name the residue obtained on strongly heating the following:(i) ZnCO\(_3\) in an open crucible;(ii) CuSO\(_4\), 5H\(_2\)O and then allowing it to cool in a desiccator.(b) State the colour changes observed on heating…
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1993
(a) State the phenomenon illustrated by the:(i) spreading of the smell of hydrogen sulphide gas in the laboratory;(ii) existence of atoms of the same element having different mass numbers(b) The atomic number of an eleme…
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1993
(a) If L is the Avogadro constant and E° is standard cell potential, state what X and Y stand for in the following expressions(i) X = \(\frac{\text{Mass of L molecules of gas or vapour}}{\text{ Mass of L molecules of hyd…
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1993
(a) State one air pollution that causes:(i) blood poisoning(ii) acid poisoning(iii) blackening of the walls of buildings(b) Mention one major chemical industry in each case which requires the following as raw materials:(…
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1993
(a) Give one disadvantage of:(i) hard water(ii) soft water(b) Explain why the degree of hardness in a sample of clear lime water is higher than in another sample that has been turned milky by carbon (IV) oxide.
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1993
Classify each of the following as physical change or a chemical change:(a) fractional distillation of liquefied air;(b) cracking of petroleum fractions;(c) conversion of rhombic sulphur to monoclinic sulphur;(d) chromato…
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1993
Copper metal will react with concentrated trioxonitrate (V) acid to give?
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1993
Which of the following separation is routinely applied in the petroleum industry
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1993
Which of the following pairs illustrates isotopy?
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