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Among the following ions, for which one standard enthalpy of ionization is zero

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${OH}_{(a q)}$

$H_{(aq)}^{+}$

${Cl}_{(aq)}$

$H_{(aq)}$

answer is D.

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Detailed Solution

Enthalpy of formation can also be expressed for ion and when it is done so the enthalpy is called enthalpy of ionization.
The process easier we arbitrarily put one ion’s enthalpy of ionization as 0.

And it is by convention taken 0 for $H_{(aq)}^{+}$ since it is easily available and comparable in this form.

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