Discussion
Assertion (A): Zirconia for structural use contains an addition of yttria or magnesia.
Reason (R): The stabiliser retains the tetragonal phase in a metastable state at room temperature.
Answer: B
Both are true and the reason gives the purpose: the toughening depends on the transformation being available to happen at a crack tip, which requires the tetragonal phase to be present and poised rather than already converted.
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