The correct order of electron affinity is :

Two 5 molal solutions are prepared by dissolving a non-electrolyte non-volatile solute separately in the solvents X and Y. The molecular weights of the solvents are M_x and M_y, respectively where M_x = $${3 \over 4}$$ My. The relative lowering of vapor pressure of the solution in X is ''m'' times that of the solution in Y. Given that the number of moles of solute is very small in comparison to that of the solvent, the value of ''m'' is :

For a first order reaction, A $$ \to $$ P, t_1/2 (half-life) is 10 days The time required for $${1 \over 4}$$^th conversion of A (in days) is : (ln 2 = 0.693,    ln 3 = 1.1)

In KO₂, the nature of oxygen species and the oxydation state of oxygen atom are, respectively :