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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
Correct Answer: 4
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.
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