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Whish is/are correct statement?...

Whish is/are correct statement?

A

The ionic crystal of `AgBr` may have schottky defect

B

Amorphous solid are isotropic

C

Packing fraction of 2D-hcp packing is 0.74

D


`uarr uarr uarr uarr` represents magnetic moment of ferromagnetic substance.

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