Question

Encircle the odd one out and give reasons for your choice.

Hydrogen, oxygen, soda water, CNG gas, air

Answer 1

1. Gases neither have definite shape nor volume of its own, they take the shape of the container in which they are enclosed.
2. Among the given list of items all are gaseous substances except soda water which is a liquid having definite volume but no definite shape.
   Hence soda water is the odd one among the given items.