For the reaction 2NO₂ (g) $$\leftrightharpoons$$ 2NO (g) + O₂ (g), (K_c = 1.8 $$\times$$ 10^-6 at 184^oC) (R = 0.0831 kJ/(mol. K))
When K_p and K_c are compared at 184^oC , it is found that :

Hydrogen ion concentration in mol / L in a solution of pH = 5.4 will be :

What is the conjugate base of OH^-?

Which one of the following species is diamagnetic in nature?