The number of endothermic process/es from the following is _______.
A. $$I_2(g) \to 2I(g)$$
B. $$HCl(g) \to H(g) + Cl(g)$$
C. $$H_2O(l) \to H_2O(g)$$
D. $$C(s) + O_2(g) \to CO_2(g)$$
E. Dissolution of ammonium chloride in water

A: I₂(g)→2I(g) - Bond breaking, endothermic ✓

B: HCl(g)→H(g)+Cl(g) - Bond breaking, endothermic ✓

C: H₂O(l)→H₂O(g) - Vaporization, endothermic ✓

D: C(s)+O₂(g)→CO₂(g) - Combustion, exothermic ✗

E: Dissolution of NH₄Cl - Endothermic ✓

Number of endothermic processes = 4 (A, B, C, E). The answer is 4.