Correct Answer: C. Uqbah b. Nafi

Correct Answer: D. tuyeres

Explanation

Pre-heated air at about 600

Correct Answer: C. wood ash

Explanation

(a)Total working population in 1955 = 51 + 29 = 80

Total working population in 1960 = 107 + 33 = 140

The difference in working population = 140 - 80 = 60

Percentage increase = \(\frac{60}{1}\) x 100 = 75%

(b) Dependant population in 1955

0 - 16 = 150

above 60 =15

165

Working population in 1955 = 51 + 29 = 80

Ratio of dependent population = \(\frac{165}{80} = \frac{33}{16}\) = 33:16

(c) Dependant population in 1960

0 - 16 = 143

above 60 =17

160

Working population in 1960 = 107 + 33 = 140

Ratio of dependant population = \(\frac{160}{140} = \frac{8}{7}\) = 8:7

(d) Dependency ratio decreased between 1955 and 1960.

Correct Answer: A. government financial grant

Explanation

(a)(i) coke (ii) ammoniacal liquor/coal tar (iii) coal gas

(b) (i) methane (ii) because sulphur is removed in the gasification process/it does not contain sulphur or sulphur compounds.

(c)(i) C\(_{(S)}\) + O\(_{2(g)}\) --> CO\(_{2(g)}\)

(ii) I. is a gas at room temperature - it is a colourless gas - it is an odourless gas - it is denser than air - it readily liquefies and solidifies/easily compressible.

II. - reacts with alkali to form trioxocarbonate (IV) - it is soluble in water - reacts with (burning) Mg to form MgO - reacts with red hot carbon to form CO - It is weakly acidic in water - it does not support combustion.

(d)(i) I. diamond graphite II. -coal/ lampblack/soot/carbon black - coke - charcoal.

(ii) I. Diamond - as a cutting tool - as jewellery;

Graphite - as a lubricant - as an electrode - as pigment in paints - as neutron moderators in nuclear reactors.

II. Coke - as a fuel -as a reducing agent/in the extraction of metals - preparation of carbides - for making water gas/producer gas.

Coal - as a fuel -as a starting material for chemicals.

Charcoal - as a fuel - as absorbent/in gas mask - in the purification of gases - in the recovery of industrial solvent - for removing colouring matter from substances

Lampblack/Soot/carbon black: - to colour rubber tyres - to make boot/shoe polish - to make printers ink - to make black paint - typewriting ribbons - carbon paper.

(e)(i) I. S\(_{(s)}\) + O\(_{2(g)}\) --> SO\(_{2(g)}\)

II. 2SO\(_{2(g)}\) + O\(_{2(g)}\) \(\rightleftharpoons\) 2SO\(_{3(g)}\)

III. SO\(_{3(g)}\) + H\(_2\)SO\(_{4(g)}\) -> H\(_2\)S\(_2\)O7\(_{7(l)}\)

IV. H\(_2\)SO7\(_{7(l)}\) + H\(_2\)O\(_{(l)}\) -> 2H\(_2\)SO\(_{4(l)}\)

(ii) I. - dehydrating agent

II. precipitating agent/displacement agent.

Correct Answer: A. right

Explanation

The rights belonging to an individual by virtue of citizenship, including civil liberties, due process, equal protection of the laws, and freedom from discrimination.

Correct Answer: B. Mandara and Alantika

Correct Answer: C. erythrocyte

Explanation

Red blood cells are microscopic and have the shape of a flat disk or doughnut, which is round with an indentation in the center, but it isn't hollow. Red blood cells don't have a nucleus like white blood cells, allowing them to change shape and move throughout your body easier.

Correct Answer: C. positive thermotaxis