1.

The correct statement in the following is

Answer»

The ionic crstal of AgBr has Schottky defect
The unit cell having crystal PARAMETERS, `a=b NEC,alpha=beta=90^(@),gamma=120^(@)` is hexagonal
In ionic COMPOUNDS having Frenkel defect the RATIO `(gamma_(+))/(gamma_(-))` is high
The coordination number of `Na^(+)` ion in NACl is 4.

Solution :A crystal system is hexagonal if its unit cell having `a=bnec` axial ratio and `alpha=beta=90^(@),gamma=120^(@)` axial angles.


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