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Which outcome occurs when applying mechanical stress to a molecular solid?

A)Chain scission decreases molar mass
B)Increased crystallinity enhances transparency
C)Debonding modifies electronic band structure
D)Plastic deformation exceeds elastic limit

💡 Explanation

Chain scission happens because mechanical stress overcomes van der Waals attractions during crack propagation. This is known as a fracture. This process reduces average polymer chain length; therefore it decreases the molar mass, rather than increasing crystallinity or band structure; plastic formation requires higher stress.

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