Question

Which of the following is a redox reaction?

• A. \( \text{NaCl} + \text{KNO}_3 \rightarrow \text{NaNO}_3 + \text{KCl} \)
• B. \( \text{Mg(OH)}_2 + 2\text{NH}_4\text{Cl} \rightarrow \text{MgCl}_2 + 2\text{NH}_4\text{OH} \)
• C. \( \text{CaC}_2\text{O}_4 + 2\text{HCl} \rightarrow \text{CaCl}_2 + \text{H}_2\text{C}_2\text{O}_4 \)
• D. \( \text{Zn} + 2\text{AgCN} \rightarrow 2\text{Ag} + \text{Zn(CN)}_2 \)

Hint:

Look for elements in their free state (like Zn or Ag) changing into compounds.

Answer 1

The Correct Option is D