What would be the electrode potential for the given half cell reaction at pH = 5? ______.

2H₂O $$ \to $$ O₂ + 4H^{$$ \oplus $$} + 4e^– ; $$E_{red}^0$$ = 1.23 V

(R = 8.314 J mol^–1 K^–1 ; Temp = 298 k;

oxygen under std. atm. pressure of 1 bar)

The volume (in mL) of 0.125 M AgNO₃ required to quantitatively precipitate chloride ions in 0.3 g of [Co(NH₃)₆]Cl₃ is ________.
M_{[Co(NH3)6Cl3]} = 267.46 g/mol
M_AgNO3 = 169.87 g/mol

The decreasing order of reactivity towards dehydrohalogenation (E₁) reaction of the following compounds is :

The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are :