MCQ
What is $\mathrm{A}$ in the following reaction?


- A

- ✓

- C

- D








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Assume Planck's constant $( h )=6.4 \times 10^{-34}\,Js$ Speed of light $( c )=3.0 \times 10^8\,m / s$ and Avogadro's constant $\left( N _{ A }\right)=6 \times 10^{23} / mol$

Reason : In mercury cell, the electrolyte is a paste of $KOH$ and $ZnO$.