Correct Answer: A. refused to accept the ring

Correct Answer: A. disobedient

Correct Answer: C) coating of steel to prevent rusting

Explanation

Vulcanization is a chemical process that converts natural rubber and other polydiene elastomers into cross-linked polymers. The most common vulcanization agent is sulfur.

Sulfur dyes are the most commonly used dyes manufactured for cotton in terms of volume. They are cheap, generally have good wash-fastness, and are easy to apply. Sulfur dyes are predominantly black, brown, and dark blue.

Finally, sulphur is used manufacture of tetraoxosulphate (VI) acid. In the first step, sulfur is burned to produce sulfur dioxide. This is then oxidized to sulfur trioxide using oxygen in the presence of a vanadium(V) oxide catalyst.

On the other hand, corrision takes place when sulphur reacts with water causing sulphuric acid which is a high corrodant material.

Correct Answer: A) Cactus

Explanation

The question is asking which plant can survive in very dry conditions. The options are: A) Cactus, B) Raphia palm, C) Triplochiton scleroxylon, and D) Parkie biglobosa. The correct answer is A) Cactus. Cactus plants have adapted to their environment and can survive in extremely dry conditions because they store water in their thick stems. This allows them to survive long periods of drought. Cacti are native to arid regions of North and South America. They have evolved to survive in these harsh environments by developing specialized structures such as spines instead of leaves to reduce water loss through transpiration. While other plants may also have adaptations that allow them to survive in dry environments, the cactus is particularly well-suited to these conditions. For example, Raphia palm is a tropical plant that thrives in wet conditions, Triplochiton scleroxylon is a tree that grows in moist forests, and Parkie biglobosa is a deciduous tree that grows in savannas and woodlands. In summary, the plant that can withstand extreme dryness is the cactus because it has adapted to store water in its thick stem and has other specialized structures that reduce water loss.

Correct Answer: B. turn out

Correct Answer: B. providing resistance against malaria

Explanation

(a) Business Merger; is the fusion of two or more business enterprises through direct acquisition of the net assets of the other i.e, the coming together of two or more formerly independent companies to form one bigger and united company.

(b) Reasons why some businesses merge include:

(i) To obtain the economies of large scale.

(ii) To gain security from cut- throat competition.

(iii) To diversify their activities.

(iv) To raise enough capital for expansion.

(v) To obtain raw materials from direct sources and at lower prices.

(vi) To fight economic recession.

(c) Disadvantages of business merger include:

(i) The business can become a monopolist.

(ii) Merger of companies may lead to un-employment as some workers may be retrenched.

(iii) It does not encourage specialisation.

Correct Answer: C. their initial capital is easy to rise

Correct Answer: B)

CaO

Explanation

Quicklime is a common name for calcium oxide, which has the chemical formulaCaO. It is a white, caustic, alkaline substance that can absorb water and carbon dioxide from the atmosphere. Quicklime is produced by heating limestone (calcium carbonate, CaCO₃) in a process called calcination or lime-burning.

Let's briefly discuss the other options to understand why they are not correct:

Option A: Ca(OH)₂ is calcium hydroxide, also known as slaked lime or hydrated lime. It is formed when quicklime (CaO) reacts with water.

Option C: CaCO₃ is calcium carbonate, commonly found in rocks as limestone, marble, and chalk. It is the starting material in the production of quicklime.

Option D: CaSO₄.2H₂O is calcium sulfate dihydrate, also known as gypsum. It is used in the construction industry to make plaster and wallboard.

Option E: CaCl₂ is calcium chloride, a salt commonly used as a de-icing agent and as a drying agent in various industrial processes.

In summary, the correct formula for quicklime isCaO.

Correct Answer: D. promoting equitable distribution of wealth