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← ScienceWhich outcome occurs when molten zinc sulfide cools unevenly?
A)Increased ionic crystal growth
B)Decreased covalent bond defects
C)Elevated grain boundary stresses✓
D)Suppressed sulfide oxidation rate
💡 Explanation
Uneven cooling induces thermal gradients, leading to differential contraction. This causes elevated grain boundary stresses from restricted movement when ionic bonds form, therefore cracking occurs, rather than uniform growth under equilibrium conditions.
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