Consider the following statements,
I. Possibe variations for a cubic crystal system is primitive only
II. The axial angles of a hexagonal crystal system are `alpha=beta=90^@ " and " gamma = 120^@` .
Which of the above statements(s) is / are true ?

Options

A. Only I
B. Only II
C. Both I and II
D. None of these

Answer

B

Explanation

For a cubic crystal system, the possible variations are primitive, body centred and face centred .
The axial angles of a hexagonal crystal system are `alpha = beta = 90^@ " and " gamma = 120^@`