What is the diffrence between " It is scheduled" and " It has been scheduled" ?
No difference in meaning.
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No . I want exact difference between those.
Rajesh PsNo . I want exact difference between those.

As I said, there is not difference in meaning. They would be used under circumstances that may differ.

When is the meeting?

It is scheduled for Tuesday.

It is scheduled, as usual, for Tuesday

It has been scheduled, for a long time, for Tuesday.

It has been scheduled by the committee.

The basic difference is in the tense: the perfect cannot be used with a specific time reference as to when the action occured.