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← ScienceFor NaCl crystal growth in humid air, which outcome results from surface adsorption?
A)Increased ion mobility on surface✓
B)Decreased crystal growth rate
C)Enhanced bulk diffusion of ions
D)Development of point defects in bulk
💡 Explanation
Water adsorption increases ion mobility via *surface diffusion*, facilitating Na+ and Cl- pairing because water weakens electrostatic forces. Therefore, surface ion diffusion increases the crystal growth rate, rather than slowing it, because it overcomes limitations in bulk diffusion.
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