Consider the following equation: Ag+ (aq) + CI‾aq) → Agv+vCI‾ (s) ; ∆H = -65.7 kJmol-1. From the equation, it can be deduced that

A. direct combination is involved and the reaction is endothermic
B. a solid is formed and heat is evolved
C. activation energy is high and a catalyst is required
D. the reaction is endothermic and occurs at high temperature

Correct Answer: Option B

B. a solid is formed and heat is evolved