The application can be either in:
2. Hindi, or
3. The official language of the area in which application is being made.
As per Rule 26 of the erstwhile CIC (Management) Regulation, 2007 which have been quashed by the Delhi High Court, the second appeal or a reply to it can be filed before the CIC in English or Hindi only or should be accompanied by a certified translated version of it in English or Hindi.