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A dehydrating agent is a substance that dries or removes water from a substance. so when sulphuric acid with sugar, the sugar is charred by the removal of water, \(C_{12}H_{22}O_{11(s)} + H_2SO_{4(aq)} → 12C(s) + 11H_2O_{(l}) + H_2SO_{4(aq)}\) the sulphuric acid is serving as a dehydrating agent.

Sodium reacts vigorously with water to produce a solution of sodium hydroxide and hydrogen gas. Sodium hydroxide is an alkali. 2Na + 2H\(_2\)O → 2NaOH + H\(_2\)

Cl is diatomic; 4\(Cl_2\) = 8 atoms in total. Oxygen is triatomic in Ozone; 3\(O_3\) = 9 atoms in total Butane is \(C_4H_{10}\) = 14 atoms in total. Argon is monoatomic; = 7atoms. hence Option D is correct.

In the given sentence, the leader of the delegation was praised or approved of ("commended") for how he handled the matter. The opposite of this would be if their hosts were disapproved of or found fault with ("criticized") for something related to the matter. So, "criticized" is the word that best fits the gap and is opposite in meaning to "commended" in this context.

The word "frugal" refers to being economical or careful with money and resources. The opposite of frugal, in terms of spending habits, would be "extravagant," which refers to spending money freely and lavishly, without care.

The word "flamboyance" refers to an extravagant or showy manner, someone who is bold and noticeable. The opposite of this would be modesty, which means being humble or unassuming.

The sentence suggests that people prefer stories with realistic settings, meaning those that are believable and grounded in reality, rather than those with far-fetched (unlikely or implausible) backgrounds.

The sentence means that the goal is to avoid conflict or disagreement, which is often what happens in a compromise. A "controversy" is a disagreement or dispute, which is the opposite of reaching a compromise.

The sentence compares a promotion due to efficiency with a demotion due to the opposite quality. "Incompetence" means lack of ability or skill, which is the opposite of being efficient.

The sentence contrasts Okon's flourishing business with his father's business, so the opposite of "flourishing" (which means thriving or growing well) should be something that suggests a business is not doing well. So the opposite is "declining".

The sentence suggests being prepared and aware of potential situations in order not to be caught "unawares". The opposite of "unawares" is "alert." To be alert means to be watchful and ready to respond to any changes or dangers.

The sentence talks about contributions that are expected to be made without being forced. The opposite of "compulsory" is "voluntary".

The word "reinstated" means to restore someone to their previous position or job, which is the opposite of being "sacked" or fired.

Immunization refers to the process by which a person is made immune or resistant to an infectious disease, often through vaccination. Vaccination is closely related but refers specifically to the act of administering a vaccine, which is part of the immunization process. Injection refers to the method of delivering a vaccine, but it does not refer to the overall programme or process aimed at preventing diseases

Unequivocally means clearly and without any doubt. When someone states something unequivocally, they are making a strong, clear statement.