1. The state of matter which has no definite shape or volume is called.
Gas
Explanation for correct option:
(C) Gas:
Explanation for incorrect options:
(A) Solids have a greater intermolecular force of attraction and less intermolecular space, as a result, they possess definite shape and definite volume.
(B) Liquids have the intermediate or moderate intermolecular force of attraction, these particles have a little bit of movement which is more than solid but less than gases. Hence it has a definite volume but not a definite shape. It takes up the shape of the container in which it is kept.
(d) Water is liquid, it has a definite volume but not a definite shape.
Hence option (C) gas is the correct answer.