1.

In a Tetragonal unit cell :

Answer»

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

Answer :A


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