Solution:
131 is the only prime number in the group.

Solution:
All other groups contain only one vowel.

Solution:
All except Veil cover the head, while veil covers the face.

Solution:
All except Leh are capitals of Indian states, while Leh is a hill station.

Solution:
In all other pairs, all things are lifeless.

Solution:
In all other pairs, second is a part of the first.

Solution:
In all other groups, the numbers are in the ratio 2 : 3 : 6 : 4