`Delta H_("fusion")` of a substance is 'x' and `Delta H_("vap")` is 'y', then `Delta H_("sublimation")` will be

In which of the following process of neutralization is the magnitude of Delta H_("neutralization") less than that of Delta H_("ionization") of water ?

Why Delta H_(f)^(@) of elements is zero?

From the following data, mark the option (s) where Delta H is correctlt written for the given reaction. Given H^(+)(aq) + OH^(-)(aq) rarr H_(2)O(l), Delta H = -57.3 kJ Delta H_("solution") of HA(g) = -70.7kJ/mol Delta H_("solution") of BOH(g) = 20kJ/mol Delta H_("ionization") of HA = 15 kJ/mol and BOH is a strong base Reaction Delta H_(r)(kJ//mol)

The expression Delta H _(su b) ^(0) = Delta H _(fus) ^(0) + Delta H _(vap) ^(0) is true at all