Question

Q. Which of the following is a redox reaction?
A \(\mathrm{NaCl}+\mathrm{KNO}_{3} \longrightarrow \mathrm{NaNO}_{3}+\mathrm{KCl}\)
B \(\mathrm{CaC}_{2} \mathrm{O}_{4}+2 \mathrm{HCl} \longrightarrow \mathrm{CaCl}_{2}+\mathrm{H}_{2} \mathrm{C}_{2} \mathrm{O}_{4}\)
c \(\mathrm{Mg}(\mathrm{OH})_{2}+2 \mathrm{NH}_{4} \mathrm{Cl} \longrightarrow \mathrm{MgCl}_{2}+2 \mathrm{NH}_{4} \mathrm{OH}\)
(D) \(\mathrm{Zn}+2 \mathrm{AgCN} \longrightarrow 2 \mathrm{Ag}+\mathrm{Zn}(\mathrm{CN})_{2}\).

Answer 1

Solution:
\(\stackrel{0}{Z n+2 A g C N} \stackrel{+1}{2} \stackrel{0}{A g}+\stackrel{+}{Z} n(C N)_{2}\)
\(\stackrel{0}{Z n \rightarrow Z n(C N)_{2}} \quad\) (Oxidation)
\(\stackrel{+1}{A g C N} \rightarrow \stackrel{0}{A g} \quad\) (Reduction)

Answer 2

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Answer 3

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