The mean of 2 - t, 4 + t, 3 - 2t, 2 + t and t - 1 is

• A. t
• B. -t
• C. 2
• D. -2

(a)(i) Define oxidation in terms of electron transfer.

(ii) Write balanced equations for the half reactions for the following changes in acidic solution: Mn0\(^-_4\) + Fe\(^{2+}\) —> Mn\(^{2+}\) + Fe\(^{3+}\)

(b)(i) Distinguish between an electrolytic celI and an electrochemical cell.

(ii) Sketch a cell for the electrolysis of molten magnesium chloride. Lable the anode and the cathode and indicate the direction of electron flow. Give the electrode reactions.

(iii) Give one reason why a platinum anode is not suitable for the eloctrolysis in (b)(i) above.

(c) Calculate the mass of lead that would be deposited from a solution of lead (II) trioxonitrate by the same quantity of electrically depositing 1.35g of copper. (Cu = 63.5, Pb = 207)

Under which of the following climates would you expect physical weathering to be normally most active?

• A. Savannah
• B. Hot Desert
• C. Warm Temperate
• D. Equatorial

The translation of the verse below is

• A.
• B.
• C.
• D.

'....Why is your spirit so vexed that you eat no food? The addressee was sad because

• A. Naboth refused to give him his vineyard
• B. he had an encounter with Elijah
• C. his inhritance had been taken away
• D. Jezebel refused to speak to him

wholesalers play an important role in the distribution of goods and services because they?

• A. are located very close to consumers
• B. finance both producers and retailers
• C. pass information on from retailers to consumers
• D. sell in small units to consumers

The net profit of a business is determined by

• A. deducting cost of goods sold from sales
• B. deducting purchases from sales
• C. adding commissions recieved to gross profit
• D. deducting all expenses from gross profit and other income

In the desert region the most prominent agent of erosion is

• A. thunderstorms
• B. rainfall
• C. rivers
• D. wind

Pond weeds normally lack thick layers of cuticle because

• A. their system of photosynthesis is not efficient
• B. there is no danger of becoming desiccated
• C. their leaves are either dissected or non-shaped
• D. there are numerous stoma on their upper epidermis

What is the primary focus of animal husbandry in agriculture?

• A. Veterinary care for domestic pets
• B. Protection of wildlife habitats
• C. Breeding and management of farm animals
• D. Crop cultivation for livestock feed