Discussion
Assertion (A): Aluminium nitride has displaced beryllia in many electronic substrate applications.
Reason (R): Beryllia powder is highly toxic and demands stringent handling precautions.
Answer: C
Both are true and the reason gives the driver: the thermal performance of beryllia is better, so the substitution is made on grounds of safety rather than of technical merit. Toxicity has settled a question that performance alone would not.
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