Question

Q.9 The crystal system for which a + b + c and
a=B=y=90° is said to be:
(1) triclinic
(2) tetragonal
(3) cubic
(4) orthorhombic​

Answer 1

Answer:

2) tetragonal

Explanation:

crystal system for a+b+c

Answer 2

Answer:

C

rhombohedral

We have given from the question 

a=b=c   & α=β=γ=90∘

Form the given data 

The given crystal system this condition is of rhombohedral.

Hence,

The option (C) is correct.