Question

In which of the following both species have zero standard enthalpy of formation?

options is..........

H2(g) ,H^+(aq).
D2 (g),D2O(l).
P , I2 (g) O2 (g) , O3 (g)


help ! help ! help!!!!!!​

Answer 1

Answer::1 option

H2 and H+

Explanation:

Answer 2

Answer:

The standard enthalpy of formation is the heat evolved when 1 mole of a substance in its constituent form or the elementary form is converted into a compound.

Therefore, the standard enthalpy of formation is always zero for an element. Since, here in the options I2 , H2, O2 all these are having standard enthalpy of formation as zero since they are in their elementary state.