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Question

Chemistry Question on Redox reactions

Which of the following is a redox reaction ?

A

NaCl+KNO3−>NaNO3+KCl{ NaCl + KNO3 -> NaNO3 + KCl}

B

CaC2O4+2HCl−>CaCl2+H2C2O4{CaC2O4 + 2HCl -> CaCl2 + H2C2O4 }

C

Mg(OH)2+2NH4Cl−>MgCl2+2NH4OH{Mg(OH)2 + 2NH4Cl -> MgCl2 + 2NH4OH }

D

Zn+2AgCN−>2Ag+Zn(CN)2.{ Zn + 2AgCN -> 2Ag + Zn(CN)2. }

Answer

Zn+2AgCN−>2Ag+Zn(CN)2.{ Zn + 2AgCN -> 2Ag + Zn(CN)2. }

Explanation

Solution

Zn0+2Ag+1CN→2Ag0+Zn+2(CN)2\overset{0}{Zn}+ 2\overset{+1}{Ag}CN \rightarrow 2 \overset{0}{Ag} +\overset{+2}{Zn}(CN)_2
Zn0→Zn+2(CN)2      \overset{0}{Zn} \rightarrow \overset{+2}{Zn}(CN)_2 \,\,\,\,\,\, (Oxidation)

Ag+1CN→Ag0        \overset{+1}{Ag}CN \rightarrow \overset{0}{Ag}\,\,\,\,\,\,\, (Reduction)