Q. Which of the following is a redox reaction?
A) $NaCl + {KNO}_{3} \longrightarrow {NaNO}_{3} + KCl$
B) ${CaC}_{2}O_{4} + 2HCl \longrightarrow {CaCl}_{2} + H_{2}C_{2}O_{4}$
C) $\ Ca(OH)_{2} + 2{NH}_{4}Cl \longrightarrow {CaCl}_{2} + 2{NH}_{3} + 2H_{2}O$
D) $2K\left\lbrack Ag(CN)_{2} \right\rbrack + Zn \longrightarrow 2Ag + K_{2}\lbrack Zn(CN)_{4}\rbrack$
Explanation
(d)
$2K\left\lbrack Ag(CN)_{2} \right\rbrack + Zn \rightarrow 2Ag + K_{2}\lbrack Zn(CN)_{4}\rbrack$
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.