will it be possible to set rights (view/edit/approval/publish/unpublish) for group of pages at one go.
I think it is possible to do at the page level, could it be possible to set rights for multiple pages at one go.
Could anyone please reply and provide the process to do multiple pages at one time?
If you only have access to Edit mode, you can only set access rights for one page at a time (the one you're currently editing) via the "Visible to...(manage)" option.
If you have access to Admin mode, you can use the Set Access Rights option from the Admin tab to set rights for multiple pages in a hierarchical inheritance manner. (e.g. you can set rights for a top node and make the subpages inherit the same rights.)
Unfortunately there is no other way to bulk set access rights for a selected group of pages (or content types).
(In my reply I assumed you meant setting access rights through the UI. As Mathias Kunto points out in your duplicate post in the EPiServer 7 forum, it can be done in code.)