Q.

At                  iron changes its BCC structure to FCC.

A. 308oc
B. 568oc
C. 771oc
D. 906oc
Answer» D. 906oc
Explanation: similar to metallic crystals, a few non-metallic crystals also change form due to temperature and pressure differences. this process is termed as polymorphism. iron changes from bcc at room temperature to fcc form at 906oc.
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