40 men were employed in a farm, and they produced an average of 30 tonnes of cassava per person. Calculate the total product.

• A. 1,300 tonnes
• B. 1,100 tonnes
• C. 1,200 tonnes
• D. 1,400 tonnes

(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) State the colour observed on adding a few drops of dilute tetraoxosulphate (VI) acid to the system representedby the following equation: Cr\(_2\)O\(^{2-}_{7(aq)}\) + H\(_2O_{(l)}\) \(\rightleftharpoons\) 2CrO\(^{2-}_{4(aq)}\) + 2H\(^+_{(aq)}\). Explain your answer.

(c)(i) State and explain what would be observed if hydrogen sulphide gas were bubbled into acidified K\(_2\)Cr\(_2\)O\(_7\). Write an equation for the reaction.

(ii) What precaution should be taken to avoid excessive exposure to hydrogen sulphide gas while it is being generated in the laboratory?

Choose the interpretation that is most appropriate for each sentence.

The newly employed workers were remunerated handsomely. This means that

• A. both old and new workers were paid
• B. only newly employed workers were paid
• C. the salaries of the new workers were attractive
• D. the salaries of the new workers were paid promptly

An example of a climatic hazard is?

• A. volcanic eruption
• B. earthquake
• C. hurricane
• D. coastal erosion

The price elasticity of supply of perishable goods is_________?

• A. Elastic
• B. Unitary
• C. Inelastic
• D. Zero

A metal that forms soluble trioxosulphate (IV) ion is

• A) barium
• B) potassium
• C) manganese
• D) aluminium

The system of voting on behalf of another person is known as

• A. voting by lot
• B. casting votes
• C. voting by proxy
• D. perference voting

The Bureau for Public Enterprises is charged with the responsibility for

• A. privatization and commercialization
• B. generating revenue
• C. eradicating poverty
• D. providing employment opportunities

Fill each of the gap with the appropriate option from the list following the the gap.

We had a dull evening because ......?

• A. hardly the talk had begun when the lights went off
• B. hardly had the talk begun when the light went off
• C. the talk had hardly begun when the lights had gone out
• D. the lights had hardly gone out when the talk began

Forces 90N and 120N act in the directions 120° and 240° respectively. Find the resultant of these forces.

• A. \(-45(2i + \sqrt{2}j)\)
• B. \(60(\sqrt{3}i + 7j)\)
• C. \(30(7i + \sqrt{3}j)\)
• D. \(-15(7i + \sqrt{3}j)\)