Question

Which of the following is an example of a redox reaction?

• A. \( \text{H}_2 + \text{Cl}_2 \rightarrow 2 \, \text{HCl} \)
• B. \( \text{NaCl} + \text{AgNO}_3 \rightarrow \text{NaNO}_3 + \text{AgCl} \)
• C. \( \text{C}_2\text{H}_5\text{OH} + 3 \, \text{O}_2 \rightarrow 2 \, \text{CO}_2 + 3 \, \text{H}_2\text{O} \)
• D. \( \text{H}_2 + \text{O}_2 \rightarrow 2 \, \text{H}_2\text{O} \)

Hint:

Remember: In redox reactions, one species is oxidized (loses electrons), and another species is reduced (gains electrons).

Answer 1

The Correct Option is A

Step 1: Understand redox reactions A redox reaction involves both reduction and oxidation processes. Oxidation is the loss of electrons, and reduction is the gain of electrons. Step 2: Identify the oxidation and reduction in each option Let's analyze each option: - In option (1), \( \text{H}_2 \) and \( \text{Cl}_2 \) are reacting. Here, hydrogen is oxidized (loses electrons) and chlorine is reduced (gains electrons). This is a redox reaction. - In option (2), \( \text{NaCl} + \text{AgNO}_3 \) forms \( \text{NaNO}_3 + \text{AgCl} \), which is a double displacement reaction but not a redox reaction. - In option (3), this is the combustion of ethanol, which is a redox reaction. - In option (4), the combination of hydrogen and oxygen to form water is also a redox reaction. Answer: Therefore, option (1) represents a redox reaction, where hydrogen is oxidized and chlorine is reduced. So, the correct answer is option (1).