Is a type 2 system is always unstable?
In general, a system is stable, if all real parts of the poles are negative.

It is well described here




  Is a type 2 system is always unstable?


No, the order of a system says nothing about its stability.


  If there are multiple poles at origin, that system is unstable.


This is a marginal case. It can be either unstable or slightly stable, depending on how many poles there are at the origin.