All except the Narmada‌ flow eastwards.

All, except titan, are planets of the solar system.

All, except 'arc',‌ are enclosed figures.

All, except omelette, are baked foods.

All the others are garments for the upper part of the body.

Except relaxing, all others are physical exercises. 

All the others are played with a ball.

All months, except September,‌ have 31 days.

All, except economics,‌ are branches of science.

All, except 'Mansarovar'‌, are names of rivers.