Which of the Following Processes Is Endothermic?
A)K⁺ (G)+ I^- $\frac{1}{2}$

Which of the following processes is endothermic?

A) K⁺ (g) + I^- (g) → KI(s)
B) 2Br(g) → Br₂(g)
C) Ca(s) → Ca(g)
D) 2Na(s) + $\frac{1}{2}$ O₂(g) → Na₂O(s)
E) None of the above processes is endothermic.