`I_(1)` and `I_(2)` of an element are "700" and 1200KJ/ mole respectively if ,1000KJ/ mole energy is supplied to the gaseous atomic element and the ionisation occur in succession,the ratio of monovalent and divalent cations.

The I_(1),I_(2),I_(3),I_(4) values of an element "M" are 120 kJ/mole, 600 kJ//"mole", 1000 kJ//"mole" and 8000 kJ//"mole" . Then the formula of its sulphate is

The bond dissociation energies for Cl_(2) , I_(2) and IC l are 242.3 , 151.0 and 211.3 kJ//"mole" respectively. The enthalpy of sublimation of iodine is 62.8 kJ //"mole" . What is the standard enthalpy of formation of ICI(g) nearly equal to

The ionization enthalpies of Li and Na are "520 kJ mol"^(-1) and "495 kJ mol"^(-1) respectively. They energy required to convert all the atoms present in 70 mg of Li vapours and 230 mg of sodium vapours of their respectively gaseous cations respectively are

The first and second I.E. of Mg are 750 and 1450 kJ/mole respectively. What will be the ratio of Mg^+ and Mg^(2+) ions, if one mole magnesium vapours are supplied 1200 kJ of energy?

The first and second I.E. of Mg are 750 and 1450 kJ/mole respectively. What will be the ratio of Mg^+ and Mg^(2+) ions, if one mole magnesium vapours are supplied 1200 kJ of energy?

The first three successive ionisation energies of an element Y are 900, 1757 and 14850 kJ mol^(-1) respectively. The element Y belongs to

The first three successive ionisation energies of an element X are 520, 7297 and 11810 kJ mol^(-1) respectively. The element X belongs to