Question:
Which of the following is a redox reaction?
Which of the following is a redox reaction?
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Look for elements in their free state (like Zn or Ag) changing into compounds.
Updated On: May 14, 2026
- \( \text{NaCl} + \text{KNO}_3 \rightarrow \text{NaNO}_3 + \text{KCl} \)
- \( \text{Mg(OH)}_2 + 2\text{NH}_4\text{Cl} \rightarrow \text{MgCl}_2 + 2\text{NH}_4\text{OH} \)
- \( \text{CaC}_2\text{O}_4 + 2\text{HCl} \rightarrow \text{CaCl}_2 + \text{H}_2\text{C}_2\text{O}_4 \)
- \( \text{Zn} + 2\text{AgCN} \rightarrow 2\text{Ag} + \text{Zn(CN)}_2 \)
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Concept
A redox reaction involves a change in oxidation numbers of elements due to the transfer of electrons.
Step 2: Meaning
Oxidation is an increase in oxidation state, and reduction is a decrease.
Step 3: Analysis
In reaction (D), Zn changes from 0 to +2 (oxidation), and Ag changes from +1 to 0 (reduction). Options (A), (B), and (C) are double displacement reactions where oxidation states remain constant.
Step 4: Conclusion
Reaction (D) is the only redox reaction among the choices. Final Answer: (D)
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