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← ScienceWhich consequence results when molten NaCl cools unevenly in a crucible?
A)Increased fracture toughness of the lattice
B)Crystal lattice strain and microcracks form✓
C)Elimination of grain boundary dislocations
D)Accelerated grain growth via Ostwald ripening
💡 Explanation
Uneven cooling causes lattice strain and microcracks because ions solidify at different rates, leading to internal stress via differential contraction. This prevents perfect crystal formation (rather than increasing toughness); therefore lattice strain follows, rather than dislocation reduction.
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