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JEE Main 2002
Exam
JEE Main
Year
2002
Subject
Chemistry
Chapter
Redox Reactions

JEE Main 2002 · Chemistry · Redox Reactions

Which of the following is a redox reaction ?

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

Options

  1. ANaCl+KNO3→NaNO3+KCl\mathrm{NaCl}+\mathrm{KNO}_3 \rightarrow \mathrm{NaNO}_3+\mathrm{KCl}
  2. BCaC2O4+2HCl→CaCl2+H2C2O4\mathrm{CaC}_2 \mathrm{O}_4+2 \mathrm{HCl} \rightarrow \mathrm{CaCl}_2+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4
  3. CMg(OH)2+2NH4Cl→MgCl2+2NH4OH\mathrm{Mg}(\mathrm{OH})_2+2 \mathrm{NH}_4 \mathrm{Cl} \rightarrow \mathrm{MgCl}_2+2 \mathrm{NH}_4 \mathrm{OH}
  4. DZn+2AgCN→2Ag+Zn(CN)2\mathrm{Zn}+2 \mathrm{AgCN} \rightarrow 2 \mathrm{Ag}+\mathrm{Zn}(\mathrm{CN})_2

Correct answer

D. Zn+2AgCN→2Ag+Zn(CN)2\mathrm{Zn}+2 \mathrm{AgCN} \rightarrow 2 \mathrm{Ag}+\mathrm{Zn}(\mathrm{CN})_2

Step-by-step solution

The oxidation states show a change only in reaction (d) Which of the following is a redox reaction ?
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