Two blocks of unequal masses are tied by a spring. The blocks are pulled stretching the spring slightly and the system is released on a frictionless horizontal platform. Are the forces due to the spring on the two blocks equal and opposite? If yes, is it an example of Newton's third law?
Yes, No
When the spring is stretched, the force it applies on A and B will be equal and opposites. But the active reaction pair is the force on A by the spring and the force on the spring by A. and similarly the force on B by the spring and the force on the spring by B.