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Tetragonal crystal system has the unit c...

Tetragonal crystal system has the unit cell dimensions:

A

`a=b=c and alpha = beta = gamma = 90^(@)`

B

`a=b ne c and alpha = beta = gamma =90^(@)`

C

`ane b ne c and alpha = beta = 90 ^(@) `

D

`a=b ne c and alpha =beta = 90^(@) , gamma - =120^(@)`

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The correct Answer is:
B
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