The rate of a chemical reaction doubles for every 10^oC rise of temperature. If the temperature is raised by 50^oC , the rate of the reaction increases by about :

The reduction potential of hydrogen half cell will be negative if :

The structure of IF₇ is :

The hybridization of orbitals of N atom in $$NO_3^-$$, $$NO_2^+$$ and $$NH_4^+$$ are respectively :