MCQ
Reagent $(A)$ and $(B)$ in above reaction are


- A$A = RCO_3 H , B = H_2O_2$
- B$A = RCO_3H , B = HIO_4$
- ✓$A = RCO_3 H, B = O_3$
- D$A = O_3 , B = RCO_3H$

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$S_8,\,S_2O_3^{2-},\, S_2O_7^{-2},\, S_4O_6^{-2},\, SO_3^{-2}$
$Zn\left( s \right) + C{u^{2 + }}\left( {aq} \right) \rightleftharpoons Z{n^{2 + }}\left( {aq} \right) + Cu\left( s \right)$
Standard reaction enthalpy $\left( {{\Delta _r}{H^ - }} \right)$ ....... $\mathrm{kJ}$
