What happens on heating an intrinsic semiconductor?
Am i correct considering that semiconductor would remain an intrinsic semiconductor?


Yes you are correct, the semiconductor stays in the intrinsic state. 


  What will be the changes that will occur? 


By applying temperature, some electrons acquire a state of excitement, which causes them to jump to the conduction band from the valence band. This increase of electrons in the conduction band corresponding to a decrease of the resistivity of the material.