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FAQs on NCERT Textbook: Redox Reactions - Science & Technology for UPSC CSE

1. What is a redox reaction?
Ans. A redox reaction, also known as an oxidation-reduction reaction, is a chemical reaction that involves the transfer of electrons between reactant species. In these reactions, one reactant undergoes oxidation (loses electrons) while another reactant undergoes reduction (gains electrons).
2. How can we identify if a reaction is a redox reaction?
Ans. There are several ways to identify a redox reaction. One common method is to check for changes in the oxidation states of the reactant species. If there is an increase in the oxidation state of one reactant and a decrease in the oxidation state of another reactant, it is likely a redox reaction. Another way is to look for the transfer of electrons between reactant species, which can be detected using half-reactions or by examining changes in the number of electrons in the reaction equation.
3. What are oxidizing and reducing agents in a redox reaction?
Ans. In a redox reaction, an oxidizing agent is a species that causes another species to undergo oxidation by accepting electrons. It itself gets reduced in the process. On the other hand, a reducing agent is a species that causes another species to undergo reduction by donating electrons. It itself gets oxidized in the process. Oxidizing agents and reducing agents are often present in pairs in redox reactions.
4. How does the concept of oxidation numbers relate to redox reactions?
Ans. The concept of oxidation numbers is crucial in understanding redox reactions. Oxidation numbers are assigned to atoms in a compound or ion to indicate the distribution of electrons. In a redox reaction, atoms undergo changes in their oxidation numbers. The increase in oxidation number indicates oxidation, while the decrease indicates reduction. By tracking these changes in oxidation numbers, we can identify the redox reaction and the species undergoing oxidation and reduction.
5. What are some real-life applications of redox reactions?
Ans. Redox reactions have numerous applications in our daily lives. Some examples include the rusting of iron, combustion reactions (burning of fuels), electroplating, and the operation of batteries. These reactions play a vital role in various industries, such as metal extraction, water treatment, and energy production. Understanding redox reactions helps us comprehend and utilize these processes effectively.
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