Question:
Which of the following is not allotropic modification of Zirconia?
Which of the following is not allotropic modification of Zirconia?
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Zirconia has monoclinic, tetragonal, and cubic forms. Triclinic is not a usual allotropic modification of zirconia.
Updated On: May 7, 2026
- Cubic
- Tetragonal
- Triclinic
- Monoclinic
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The Correct Option is C
Solution and Explanation
Zirconia is zirconium dioxide.
Its chemical formula is:
\[
ZrO_2.
\]
Zirconia shows different crystal modifications at different temperatures.
The important crystal forms of zirconia are:
\[
\text{Monoclinic},
\]
\[
\text{Tetragonal},
\]
and
\[
\text{Cubic}.
\]
At room temperature, zirconia is generally monoclinic.
At higher temperature, it changes to tetragonal form.
At still higher temperature, it changes to cubic form.
Triclinic form is not a normal allotropic modification of zirconia.
Therefore, the option which is not an allotropic modification of zirconia is:
\[
\text{Triclinic}.
\]
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