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Chemistry WAEC Past Questions

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1416

(a)(i) What is meant by cracking of petroleum fractions?

(ii) Write an equation for the laboratory preparation of ethene from ethanol.

(iii) Give one chemical test to distinguish between ethane and ethene.

 

(b)(i) Name the class of carbohydrates to which starch and cellulose belong.

(ii) What process is used for isolating ethanol from the other products of fermentation of sugar?

(iii) Name the organic product of the reaction between ethanol and sodium

(iv). Write the structural formula of 2-chloroethanol.

 

(c) State the reason why:

(i) benzene produces more soot than ethene on burning in excess air;

(ii) ethanoic acid has a higher boiling point than methanoic acid;

(iii) sodium chloride is used during the manufacture of soap.

(d) Give one use of: (i) ethyne (ii) coal (iii) carbon black

View Answer & Discuss WAEC 1997
1417

(a)(i) List three characteristic properties of transition metals

(ii) 0.45g of a metal M was deposited when a current of 1.8 amperes was passed for 12.5 minutes through a solution containing M\(^{2+}\). Calculate the relative atomic mass of M. [1 Faraday = 96500 C]

(iii) Give the reason why copper-plated iron corrodes easily when the surface is scratched.

 

(b)(i) State the law of definite proportions (constant composition).

(ii) Describe in outline, an experimental procedure for determining the proportion of oxygen in a given sample of copper(II) oxide.

(iii) Write an equation to show how copper (II) oxide can be obtained directly from copper (II) trioxonitrate (V)

View Answer & Discuss WAEC 1997
1418

(a) List two gases which are monatomic

(b) Mention one gas which forms:

(i) dense white fumes with ammonia vapour

(ii) yellow precipitate with ammoniacal silver trioxonitrate (V) solution.

View Answer & Discuss WAEC 1996
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1419

(a) State three postulates of the kinetic theory

(b) Name the process involved in the;

(i) spread of the smell of a perfume across a room

(ii) decrease in the yellow of a liquid after exposure in an open vessel.

View Answer & Discuss WAEC 1996
1420

(a) What is the anhydride of each of the following acids?:

(i) H\(_2\)SO\(_4\)

(ii) HNO\(_3\)

 

(b) Classify each of the: following as normal salt/acid salt/basic salt/double salt

(i) Sodium hydrogentrioxocarbonate (IV)

(ii) Iron (III) chloride

(iii) Sodium ethanoate.

View Answer & Discuss WAEC 1996
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