The number of endothermic process/es from the following is _________
A. I2(g) → 2I(g)
B. HCl(g) → H(g) + Cl(g)
C. H2O(l) → H2O(g)
D. C(s) + O2(g) → CO2(g)
E. Dissolution of ammonium chloride in water


Answer: 4
Solution:
A. This is an endothermic process (atomization) where the I2 molecule is broken into two separate iodine atoms (I), which requires energy input.
B. This is an endothermic process (atomization) as it involves breaking the H-Cl bond to form separate hydrogen (H) and chlorine (Cl) atoms, which requires energy input.
C. This is an endothermic process (vaporization) where liquid water (H2O) is converted into water vapor (H2O(g)), requiring energy to overcome intermolecular forces and increase kinetic energy.
D. This is an exothermic process (combustion) where carbon (C) combusts with oxygen (O2) to produce carbon dioxide (CO2), releasing energy in the form of heat.
E. This is an endothermic process where the dissolution of ammonium chloride in water requires energy input to break the ionic bonds in ammonium chloride and separate the ions, resulting in a decrease in temperature (endothermic).

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