Chemistry Chapter 4 book 1

1.     Liquid crystals are always

a)     Polymorphic

b)    Anisotropic

c)     Isotropic

d)    Both a and c

2.     Indicate the crystal which have low co-efficient of expansion

a)     Ionic

b)    Molecular

c)     Covalent

d)    Metallic

3.     If any crystal is rotated along an axis at 360 ⁰C and it appears twice the same then we can say

a)     Object has two fold axis of symmetry

b)    Object is unsymmetric

c)     Symmetry is not related to rotation

d)    360 angle is out of range of symmetry operation

1.b

2.a

3.a