A student spends ¼ of his pocket money on books and 1/3 on a shirt. What fraction remains?

• A. 5/6
• B.7/12
• C. 1/6
• D. 5/12

The sequence of events that best describes the formation of sandstone is?

• A. dissolution, denudation and consolidation
• B. extrusion, denudation and deposition
• C. intrusion, granulation and consolidation
• D. deposition, consolidation and cementation

Which of the following is not true about a potted plant left in the laboratory for one week without watering?

• A. the cells of the plant will be turgid
• B. there will be wilting of the plant
• C. the leaves are likely to tum yellow
• D. plant will not take in enough nutrients

How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)? (F = 96 500 C mol-)

• A. 0.5
• B. 1.0
• C. 1.5
• D. 3.0

(a) Giving different examples, mention one metal in each case which produces hydrogen on reacting with

(i) dilute mineral acid

(ii) cold water;

(iii) steam;

(iv) hot, concentrated alkali.

(b) In an experiment, excess 0.50 mol dm\(^{-3}\) HCI was added to 1Og of granulated zinc in a beaker. Other conditions remaining constant, state how the reaction rate would be affected in each case, if the experiment was repeated using:

(i) 1.0 mol dm\(^{-3}\) HCI;

(ii) 8.0g of granulated zinc;

(iii) 10g of zinc dust;

(iv) a higher volume of 0.50 mol dm HCI;

(v) a reaction vessel dipped in crushed ice;

(vi) equal volumes of water and 0.50 mol dm\(^3\) HCI.

(c) Aluminium is extracted from its ore by electrolysis.

(i) Name the ore from which the metal is extracted.

(ii) State the role of molten cryolite in the extraction.

(iii) Describe in outline how the ore is purified before electrolysis

(iv) Calculate the current in amperes required to produce 18.0g of aluminium in 1.50 hours. [Al = 27.0; F = 96500C]

(d) Give the reason why

(i) aluminium, which is a reactive metal, is resistant to corrosion.

(ii) metals are generally good reducing agents.

Transportation helps economic development through all the following except the

• A. diffusion of ideas and technology
• B. promotion of national and international trade
• C. movement of people and commodities
• D. distribution of population

The operating system performs the following operations except

• A. organization of data
• B. resource allocation
• C. creation of data
• D. arrangement of files

Given that cos 30\(^o\) = sin 60\(^o\) = \(\frac{3}{2}\) and sin 30\(^o\) = cos 60\(^o\) = \(\frac{1}{2}\), evaluate \(\frac{tan 60^o - q}{1 - tan 30^o}\)

• A. \(\sqrt{3 - 2}\)
• B. 2 - \(\sqrt{3}\)
• C. \(\sqrt{3}\)
• D. -2

the occupational distribution of population in most West African countries shows the highest concentration in

• A. agriculture and alied industries
• B. mining and manufacturing
• C. the distributive trade
• D. commerce and industries

From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences.

The chairman told members that he was open..........suggestions

• A. to
• B. for
• C. about
• D. on