Does the above sentence mean the same as: "Was the Cong right to blame the BJP?".
There may be a small difference in focus - 'right to blame' / the decision to blame them was right in the first place; 'right in blaming' / all the time they were blaming they were in the right. But effectively there's no difference.
Thank you sir. So, I am right to say, "He is right to do something", when I mean to say , "He is right in doing something"?
Probably - I'd have to know the context to say if they're entirely interchangeable. Often (perhaps always ) they are, but in certain contexts a native speaker might tend to choose one or the other.