MCQ
Which reaction cannot be used for the production of halogen acid
- ✓$2KBr + {H_2}S{O_4} \to {K_2}S{O_4} + 2HBr$
- B$NaHS{O_4} + NaCl \to N{a_2}S{O_4} + HCl$
- C$NaCl + {H_2}S{O_4} \to NaHS{O_4} + HCl$
- D$Ca{F_2} + {H_2}S{O_4} \to CaS{O_4} + 2HF$
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$Zn^{2+} + 2e^-$ $\longrightarrow$ $Zn (s) ; E^o = -0.76\,V$
$Ca^{2+} + 2e^-$ $\longrightarrow$ $Ca (s) ; E^o = -2.87\,V$
$Mg^{2+} + 2e^-$ $\longrightarrow$ $Mg (s) ; E^o = -2.36\,V$
$Ni^{2+} + 2e^-$ $\longrightarrow$ $Ni (s) ; E^o = -0.25\,V$
The reducing power of the metals increases in the order

The product in above reaction is