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Which consequence results when differential charge builds within NaCl crystal lattice?

A)Decreased piezoelectric response is detected
B)Increased capacitance across crystal surfaces
C)Reduced refractive index is observed
D)Spontaneous crack formation is observed

💡 Explanation

Crack formation results because electrostatic repulsion from asymmetrical ion distribution causes localized stress concentration; this process is **electrostatic stress concentration**. The crystal fractures therefore, rather than remaining intact. A piezoelectric effect requires external stress.

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