an inflated air ballon deflates when pricked with a pin. which property of the gaseous state is shown

Yes you are correct.

Due to the property of diffusion in gases an inflated air balloon deflates when pricked with a pin. Diffusion property in gases is very fast. The molecules in a balloon are under higher pressure and their concentration is higher (packed more closely together) hence the diffusion from inside to outside takes place, but by the very nature of diffusion outside to inside takes place very fast, when pricked with a pin making the balloon to deflate.