A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be

At 25^oC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm^$$-$$1 cm² mol^$$-$$1 and at infinite dilution its molar conductance is 238 ohm^$$-$$1 cm² mol^$$-$$1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is

Molar conductivities $$\left( {\Lambda _m^o} \right)$$ at infinite dilution of NaCl, Hcl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol^$$-$$1 respectively. $$\left( {\Lambda _m^o} \right)$$ for CH₃COOH will be

The Gibb's energy for the decomposition of Al₂O₃ at 500^oC is as follows
$${2 \over 3}$$ Al₂O₃ $$ \to $$ $${4 \over 3}$$ Al + O₂
$$\Delta $$_rG = +960 kJ mol^$$-$$1
The potential difference needed for the electrolytic reduction of aluminium oxide (Al₂O₃) at 500^oC is at least