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) + 
O2(g) → Na2O(s)
E) None of the above processes is endothermic.
Correct Answer:
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