For which of the following reaction \( \Delta H^{\circ} \) value is...

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For which of the following reaction \( \Delta H^{\circ} \) value is equal to the first ionization energy of \( \mathrm{Ca} \) is?
(a) \( \mathbb{Q a}^{+}(g) \longrightarrow \mathrm{Ca}^{2+}(\mathrm{g})+e \)
(b) \( \mathrm{Ca}(\mathrm{g}) \longrightarrow \mathrm{Ca}^{+}(\mathrm{g})+e \)
\( \mathrm{P} \)
(c) \( \mathrm{Ca}(s) \longrightarrow \mathrm{Ca}^{+}(\mathrm{g})+e \)
(d) \( \mathrm{Ca}(g) \longrightarrow \mathrm{Ca}^{2+}(g)+2 e \)
W
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