Correct Answer: C. the dominance of cold ocean currents in the region

Correct Answer: D. N93 000

Explanation

(a) (i) let x = oxidation number of sulphur 2(1) + 2 + 3(-2) = 0

x = +2

(ii) Allotropes of sulphur are: – rhombic / alpha sulphur. – monoclinic / Beta / prismatic sulphur. – amorphous / delta sulphur. – plastic sulphur

(iii) – Macromolecule / giant molecule /3 dimensional. – carbon atoms are covalently bonded. – crystalline in nature.

(b) (i) Carbon(IV)oxide. – methane. – nitrogen(I)oxide. –water vapour – ozone – chlorofluorocarbons.

(ii) – Global warming / climate change.

(iii) – Ammonium trioxonitrate (V) /aerosol (accept ammonium nitrate). – Combustion of fuel at high temperature.

(iv)

(I) 2KNO\(_3\) --> 2KNO\(_2\) + O\(_2\)

(II) 2AgNO\(_{_3(s)}\) ---> 2Ag\(_s\) + 2NO\(_{2(g)}\) + O\(_2\)

(c) (i) – Heat the solution to concentrate it or leave in a warm place.

- partially evaporate solution and allow to cool filter off crystals.

- pick out crystals

- Dry crystals with filter paper.

(ii)(1) Ammonia readily associates with water molecules through hydrogen bonding.

(II) Chlorine molecules are smaller or chlorine molecules have fewer number of electrons and the strength of van der waals forces between molecules are weaker as compared to that of iodine OR iodine molecules are higher and the wander waal's forces between molecules are stronger as compared to that of chlorine.

(d) Mr(NaCl) = 23.0 + 35.5 = 58.5g/mol\(^1\)

Mass of NaCl = 5.85g

Molar mass of NaCl= 58.5g/mol\(^1\)

Amount of NaCl in 85g = \(\frac{5.85g}{58.5gmol^{-1}}\) = 0.1mol

1 mol of NaCI = 22.4dm\(^3\) of HCI

:. 0.1 mol = \(\frac{0.1}{1}\) x 22.4 = 2.24dm\(^3\)

OR

Molar mass NaCl = 23.0 + 35.5 = 58.5gg/mol\(^1\)

58.5g of NaCl = 22.4dm\(^3\) HCl

58.5g = \(\frac{22.4}{58.5}\) x 5.85

= 2.24dm\(^3\)

Correct Answer: D. production is restricted to the availability of commodity only

Correct Answer: C. had left

Correct Answer: B. a rise in the level of savings

Correct Answer: A. their

Explanation

The underlined part in the word 'there' has a vowel sound that is similar to the vowel sound in the word 'their'. Therefore, the correct answer is 'their'.

Explanation

The boy is obviously having a nice time on the swing apparently guided by his mother. As the swing moves slowly, to and fro, the boy seems to be in a joyful and playful mood, apparently undisturbed by the social events around him

As the swing moves faster and faster and as matters become confused and uncontrollable in his head East becomes west... joy and happiness give way to serious concerns. The need arises for explanation from somebody, particularly his mother. That is the point where the identity crisis become prominent. This manifests in the rhetorical questions he asks: Where did I come from? When will I wear long trousers? Why was my father jailed? He is increasingly worried about his identity. Where did I come from? the misery around him - When will I wear long trousers?

Correct Answer: D) Fungi

Explanation

Nutrient cycling is the process where nutrients are passed through different organisms and the environment. The question is asking which group of organisms is critical in this process. The options are Aves (birds), Nematoda (roundworms), Mammalia (mammals), and Fungi. Out of the options, the correct answer is Fungi. Fungi are important in nutrient cycling because they are decomposers. They break down dead organic matter, such as leaves and wood, into simpler compounds that can be reused by other organisms. Fungi also form mutualistic relationships with plants, where they help the plants absorb nutrients from the soil in exchange for carbohydrates produced by the plants through photosynthesis. Aves, Nematoda, and Mammalia are not as critical in nutrient cycling as Fungi. While some birds and mammals may play a role in dispersing seeds and helping with pollination, they do not have as significant of a role in breaking down organic matter as fungi do. In summary, Fungi are critical in the process of nutrient cycling due to their ability to break down dead organic matter and form mutualistic relationships with plants.

Correct Answer: A. 5.62 x 10⁻³

Explanation

0.00562 = 5.62 x 10⁻³