Correct Answer: C. evacuate raw materials and minerals for export

Correct Answer: B. N68 000

Explanation

a)(i) An acid-base indicator is either a weak organic acid or base which gives different colours in an acidic or basic mediurn. (Organic dye which changes colour according to the pH/hydrogen ion concentration of the solution).

(ii) Example of an acid-base indicator is: (i) phenolphthalein. (ii) methyl red. (iii) methyl orange. (iv) methyl yellow (v) alizarin yellow. (vi) litmus paper/solution. (vii) methyl violet. (viii) bromothymol blue (ix) bromocresol green.

(b) Property exhibited by nitrogen (IV) oxide in each of the following equations:

(i) 4Cu + 2NO\(_2\) —> 4CuO + N\(_2\), NO\(_2\) is an oxidizing agent

(ii) H\(_2\)O + 2NO\(_2\) —> HNO\(_3\) + HNO\(_3\), NO\(_2\) is oxidizing agent as well as a reducing agents or NO\(_2\) serves as acid anhydride or mixed anhydride.

(c)(i) Enthalpy of combustion is the amount of heat evolved or liberated when one mole of a substance is burnt mpletely in excess oxygen.

(ii) Enthalpy of combustion is always negative because heat is always given out or the action is exothermic.

(d) To distinguish between primary cell and secondary cell.

(i) (a) Primary cells cannot be recharged while secondary cells can be recharged.

(b) Primary cells do not last long while secondary cells last long.

(c) Reactions in primary cells are not reversible while reactions in secondary cells are reversible.

(ii) Examples of each of the cells in 1(d)(i). Primary cell: radio battery, dry cell, alkaline battery, button battery, Le'clanche cells, Daniel cell, torch battery, clock battery, bicycle lamp battery (any of these).

Secondary cell: lead-acid (storage - cell), lead-acid accumulator, lithium-ion battery, battery in rechargeable lamp, car battery, nickel-metal hydride cell, phone battery, nickel-cadmium cell, (hydrogen-oxygen) fuel cell, aluminium air cell/battery (any of these).

(e) Mole is defined as the amount of substance containing 6.02 x10\(^{23}\) particles of that substance as present in 12g of carbon-12 or the amount of substance containing as many elementary entities as there are atoms in 12g of carbon-12.

(f) Amount of hydrochloric acid in 40.0cm\(^{3}\) of 0.40 mo/dm\(^{3}\) dilute HCl

n = CV; C = concn in mo/dm\(^{3}\)

n = 0.40 x \(\frac{40}{1000}\); V = volume in dm\(^{3}\)

n(mol) = 0.016mol; n = amount in mol

(g) Two substances used as electrodes during electrolysis of acidified water are: graphite (carbon) and platinum.

(h) Two forces of attraction that can exist between covalent molecules

(1) Van der waals' forces or induced dipole-dipole forces.

(2) Hydrogen bonds.

(3) Permanent dipole-dipole interactions or dipolar forces (any of the two):

(i) Products formed when butane undergoes incomplete combustion are carbon (ii) oxide and water.

(j) Electron configuration of \(_{26}\)Fe\(^{3+}\)

\(_{26}\)Fe; Fe - 3\(\bar{e}\) \(\to\) Fe\(^{3+}\) lost of 3 electrons

\(_{26}\)Fe 26 protons + 26 electrons

\(_{26}\)Fe\(^{3+}\) 26 protons + 23 electrons

\(_{26}\)Fe\(^{3+}\) \(\to\) 1s\(^2\), 2s\(^2\), 2p\(^6\), 3s\(^2\), 3P\(^2\), 3d\(^5\)

Correct Answer: C. variable factors

Correct Answer: C) 41.5°

Correct Answer: C. speculative motive

Correct Answer: C. breakfast

Explanation

The vowel sound in 'crest' is /e/. The word 'breakfast' has the same vowel sound.

Explanation

Mr. Onyimdze is a young unmarried barrister. He is educated in England. Despite his education Mr. Onyimdze has a bias for the African way of life. By his training he is a lawyer, a typical western profession. In his colonial environment, Mr. Onyimdze must strike a balance between the Whiteman's way of life and that of his own people. As a lawyer, Mr. Onyimdze cannot but dress in his legal robes when he goes to court. Yet his inclination towards the traditional way of life makes him eager to be out of European clothing when he is out of court. His favourite wear at home is the native cloth with native sandals to match. Mr. Onyimdze's favourite games are also traditional. For example he prefers ampe to tennis croquet and antsally, all of which he is familiar with because of his English training. At the garden party he guesses that the people will be playing tennis and other non-African games and wonders whether Mrs. Borofosem will let the young ladies play ampe His love for his native language-Fante-makes him believe that Mr. Okadu should speak Fante at the party. He also loves traditional foods. When the girls harass him and put pressure on him to wear English clothes, he resists them and tries to dissuade them from following Mrs. Borofosem blindly. And when the Girls ridicule him for wearing native cloth exposes his 'nakedness, he educates them on the difference between nakedness and bareness.

Mr. Onyimdze's dislike of English manners as portrayed by Mrs. Borofosem is clear. During Mr. Okadu's romance with Miss Tsiba, he insists that Mr. Okadu should do the right thing and threatens to sack him if he does not express his intensions towards Miss Tsiba in the customary way. Mr. Onyimdze's respect for tradition and the elders is total. That enable him to intervene in the matter between Nana Katawerwa and the parson. The meeting in Mr. Onyimdize's office ends in the disgrace of the parson who misquotes the Bible. Thus, Mr. Oniymdze comes off as one who is able to accommodate western values without sacrificing his own traditional way of life.

Correct Answer: B) Atoms, molecules, organelles, cells, tissues, organs, systems, organism

Explanation

This Biology question is asking about the order of hierarchical organization of living organisms. The options are presented in a sequence of different levels of organization, starting from atoms and ending with the entire organism. Option A lists atoms, molecules, compound, cells, tissues, organs, systems, and organism as the order of hierarchical organization of living organisms. However, the correct answer is Option B, which lists atoms, molecules, organelles, cells, tissues, organs, systems, and organism. Organelles are structures within cells that carry out specific functions, such as mitochondria for energy production. Cells are the basic unit of life, and tissues are groups of similar cells that work together to perform a specific function, such as muscle tissue. Organs are groups of tissues that work together to perform a specific function, such as the heart. Organ systems are groups of organs that work together to perform a specific function, such as the cardiovascular system. Option C lists atoms, elements, molecules, cells, tissues, organs, systems, and organism as the order of hierarchical organization of living organisms. Option D lists atoms, molecules, elements, cells, tissues, organs, organ systems, and organism. These options are not correct as they list elements instead of organelles and include compound instead of elements. Overall, the correct order of hierarchical organization of living organisms is atoms, molecules, organelles, cells, tissues, organs, systems, and organism.

Correct Answer: D. 1000

Explanation

¹/₃log₁₀P = 1

log₁₀P^1/3 = log₁₀10

P^1/3 = 10

P = 1000