Syringe 1 is filled with X while syringe 2 is filled with Y. When the nozzles of these syringes are blocked, the plunger of syringe 1 can be pushed inwards but the plunger of syringe 2 cannot be pushed inwards in the same manner. What can X and Y be ?

Gases have maximum spaces in between the molecules. Hence, plunger of syringe 1 can be pushed inward. Therefore, X can be nitrogen gas.

Liquids have less inter particle spaces than gases. Therefore, the plunger of syringe 2 cannot be pushed inwards as same as syringe 1. Because liquids are slightly compressible. Thus, Y can be “ cooking oil”.

Therefore, X is nitrogen gas whereas Y is cooking oil.