Correct Answer: D. del-credere agent

Correct Answer: D. inversely related

Explanation

The price level and the value of money are inversely related. The price level is the average price of goods and services in an economy. The value of money is the amount of goods and services that can be purchased with a unit of money.

When the price level increases, the value of money decreases. This is because the same amount of money can buy fewer goods and services. Conversely, when the price level decreases, the value of money increases. This is because the same amount of money can buy more goods and services.

Explanation

(a)(i) Zn; Na, Ca, Mg, etc.

(ii) Na, K, Ca.

(iii) Mg, Al, Zn, Iro

(iv) Sn, Zn, or AI

(b)(i) The forward reaction is favoured and it proceeds faster in that direction.

(ii) The reaction rate is slowed because of the reduction in the concentration of Zn.

(iii) Zinc dust will make available more area of contact and hence it favours the forward reaction speedily.

(iv) Increasing the volume of HCI will increase the concentration of the reactants and hence favours the forward reaction by speeding it up

(v) Since the reaction condition remain constant, dipping the vessel in crushed ice will alter the rate of the reaction.

(vi) Adding water will reduce the concentration of the reactants and this will slow down the reaction rate.

(c)(i) Bauxite - Al\(_2\)O\(_3\).2H\(_2\)O

(ii) The molten cryolite prevents the molten aluminium from atmospheric oxidation.

(iii) The bauxite is first heated with caustic soda under pressure — Al\(_2\)O\(_3\) + 2NaOH + 3H\(_2\)O \(\to\) 2NaAl(OH)\(_4\). The aluminate

(iii) is then seeded with aluminium hydroxide crystals to induce the precipitation of aluminium hydroxide Na Al(OH)\(_4\) Al(OH)\(_3\) + NaOH. The Al(OH)\(_2\) is then filtered off, washed, dried and heated strongly to yield Al\(_2\)O\(_3\).

2Al(OH)\(_3\) \(\to\) Al\(_2\)O\(_3\) + 3H\(_2\)O

(iv) Al\(^{3+}\) + 3e\(^-\) —> Al; 3 x 96500 —> 27; x —>18.

x = \(\frac{18}{27}\) x 3 x 96500 = 19300c

but Q = it; I x t = 193000; but t = 1.50 hrs = 1 x 3600 + 50 x 60 = 6600

I x 6600 = 193000

I = \(\frac{193000}{6600}\) = 29.2A

(d)(i) Aluminium when exposed to air acquires a thin continuous coating of aluminium oxide, which prevents further attack of the metal by atmospheric oxygen and water or steam and it is said to be corrosion-free.

(ii) Metals are generally good reducing agents because they tend to donate their electrons readily during chemical reactions.

Correct Answer: B. recalled events from the past

Explanation

The correct option is B. recalled events from the past.

The idiom *to take someone down memory lane* means to reminisce or evoke memories of past events and experiences.

Explanation

(a) Urban settlement is a relatively large, dense and permanent settlement of socially heterogeneous individuals usually found in towns, cities or megalopolis while rural settlement is a relatively small and scattered settlement of socially and culturally homogenous individuals found in villages or hamlets.

(b) Four factors responsible for the increase in size of urban settlement include:

(i) Availability of jobs (or employments)

(ii) Presence of social amenities, e.g electricity, water

(iii) Presence of administrative headquarters in urban area

(iv) Involvement of people in commercial and industrial activities in urban areas

(c) Four problems associated with urban growth:

(i) Inadequate transport facilities

(ii) Undue increase in human and vehicular traffic

(iii) Overuse and deterioration of available social services

(iv) increase in the rate of crimes.

Explanation

(b) Trees found in the forest zone of Nigeria: (i) Mahogany. (ii) African Walnut. (iii) Iroko. (iv) Opepe. (v) Obeche. (vi) Sapele wood. (vii) Silk cotton.

(c) Contributions of forest vegetation to the economic development of Nigeria:

(i) Provides raw materials for industries.

(ii) Provides raw materials for arts and crafts. (iii) Provides food. (iv) Provides jobs for hunters, lumbermen, etc.

(v) Attracts tourism. (vi) Provides wood for construction. (vii) Provides habitats for wildlife. (viii) Timber for export or foreign exchange.

(ix) Provides wood for construction purposes. (x) Provides herbs for medicine.

Correct Answer: (a) vice president, senate president, speaker of the house of representative

Correct Answer: C. charming

Correct Answer: A. London-moscow-baghdad

Correct Answer: C. 2.50 rad s^-1