Oxidizing and Reducing agent MCQ

There are two terminologies you should be familiar with: oxidising agent (also known as oxidant) and reducing agent (also known as reductant) (or reductant). By undergoing reduction, one oxidising agent causes another species to be oxidised, and vice versa. Electron donors are referred to as reducing agents, whilst electron acceptors are referred to as oxidising agents. Organic fuels, such as glucose, are the most important electron donors. In the process of cellular respiration, oxygen serves as the last electron acceptor or oxidising agent. It is the reducing agent or reductant that undergoes oxidation, while the oxidising agent or oxidant is the reducing agent or reductant. It is equal to the number of electrons that are engaged in the process of reduction or oxidation that an oxidising agent or a reducing agent has in its oxidising capacity or reducing capacity.

1. Ozone can be formed when oxygen is transformed to ozone.

1. 1. At high temperatures, there is oxidation.
   2. catalytic oxidation is oxidation that
   3. occurs under high pressure and temperatures.
   4. electric discharge that is not audible

The answer is: (d). The formation of ozone in the stratosphere is predominantly a result of UV light. Whenever ordinary oxygen molecules (O2) are struck by high-energy ultraviolet photons, the molecule is split in half, yielding two single oxygen atoms, collectively known as atomic oxygen. A released oxygen atom then joins forces with another oxygen molecule to generate a molecule of ozone as a result of the reaction.

2. Which of the following statements is not true about the situation?

1. 1. The element oxygen is neutral to litmus.
   2. Oxygen is not a combustible substance.
   3. Because oxygen is a powerful oxidising agent
   4. It helps to facilitate combustion.

The answer is: (b). Oxygen is a colourless, odourless, and tasteless gas that has no flavour or taste. It will provide assistance for life. Even though it is not combustible, it will actively aid in the combustion of combustible items. When exposed to oxygen, several compounds that would not burn in air will begin to burn. Glass, stones, and other noncombustible materials are examples of noncombustible materials. The elements are in their greater oxidation states when they are present in glass. As a result, they do not react with oxygen, and as a result, glass does not catch fire when exposed to heat. As a result, it is not flammable.

3. The acidification of KMnO4 results in the decolorization of the violet colour. H2O2 serves as an oxidant in this process.

1. 1. agent that oxidises
   2. Reducing agent
   3. oxidising and reducing agent 
   4. none of the options above

The answer is (b). When the potassium manganate(VII) solution is acidified with dilute sulfuric acid, the purple solution becomes colourless and becomes clear. It is common to add sodium carbonate solution to the potassium manganate(VII) solution to make it somewhat alkaline, which results in the purple solution first turning dark green and then precipitating into a dark brown precipitate.

4. Hydrogen peroxide is employed as a disinfectant because:

1. 1. Oxidising agents
   2. Reducing agents
   3. bleaching agents
   4. All are correct.

The answer is: (d). Hydrogen peroxide acts as a disinfectant by destroying the key components of germ cells. It has the ability to deactivate a wide range of microorganisms, including bacteria, viruses, fungus, and spores, among other things. When employed on inanimate surfaces, 3 percent hydrogen peroxide, which is readily available from commercial sources, is a stable and effective disinfection.

5. Which of the following elements’ oxides is found in nature in a neutral state?

1. 1. Hydrogen
   2. Halogens
   3. Alkali metals, 
   4. All of the above

Answer. (A) When hydrogen gas reacts with a strong acid and a weak base, the resulting solution will be acidic in nature; when hydrogen gas reacts with a strong base and a weak acid, the resulting solution will be basic in nature; and when hydrogen gas reacts with a strong base and weak acid, the resulting solution will be acidic in nature. Neutral oxides have neither basic nor acidic qualities, and as a result, when they react with acids or bases, they do not create salts. Examples of neutral oxides include carbon monoxide (CO), nitrous oxide (N2O), nitric oxide (NO), and others.

6. In addition to being referred to as “oxidation,”

1. 1. combustion and respiration 
   2. only transpiration 
   3. only combustion  
   4. Only respiration

The answer is: (d) The oxidation reaction is referred to as respiration because it involves the breakdown of glucose in the presence of oxygen, resulting in the emission of carbon dioxide, water, and a significant quantity of energy. As a result, the oxidation reaction is defined as the use of oxygen to react with water and produce products. The oxygen that a cell takes in reacts with glucose to make Adenosine triphosphate (ATP), and the cell exhales carbon dioxide and water. A reduction reaction occurs when glucose is oxidised and oxygen is reduced in this oxidation reaction.

7. In the reaction of copper oxide (CuO) and carbon monoxide (CO), the reducing agent is:

1. 1. CuO 
   2. CO 
   3. Cu 
   4. CO2 

Answer: (b). Because it will have a negative charge associated with it, the chemical that obtains electrons is referred to as the reducing agent. Cu is a reducing agent because when it combines with oxygen, it produces oxygen, which suggests that copper is the reducing agent.