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Chemistry 1991 WAEC Past Questions

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41

(a) Give two reasons why fused alumina is mixed with cryolite in the electrolytic extraction of aluminium.

(b) Write an equation for the reaction of sodium hydroxide with bauxite.

View Answer & Discuss WAEC 1991
42

(a) Name the industrial process by which ethene is obtained from petroleum fractions

(b) Give the I. U. P.A.C name of the isomer whose structure is shown below.

(c) Illustrate with an equation, one reaction in which benzene behaves as:

(i) unsaturated hydrocarbon

(ii) a saturated hydrocarbon

View Answer & Discuss WAEC 1991
43

 Give one oxide in each case which;

(a) can act as a reducing agent

(b) can be used as a refrigerant

(c) is the anhydride of a strong acid;

(d) is yellow when hot and white then hot and white when cold;

(f) is usad as a pigment in paints.

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44

 Sketch a curve to show how the solubility of a gas varies with increasing temperature

View Answer & Discuss WAEC 1991
45

The set-up shown in the diagram below was used to separate a drop of universal indicator into the constituent dyes using ethyl ethanoate as the solvent.

(a) What name is given to the separate strated in the diagram?

(b) State: (i) how many components are resolved in the separation;

(ii) the material normally used in laborary as the adsorbent medium;

(iii) which of the labels the point of application of the indicator.

View Answer & Discuss WAEC 1991
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