The Fourth Schedule to the Constitution of India deals with:

The Fourth Schedule to the Constitution of India deals with:

provisions related to the administration of tribal areas.
allocation of seats in the Council of States.
the Union List, the State List and the Concurrent List.
recognized languages of the Union of India.
This question was previously asked in
UPSC NDA-2 – 2015
The correct option is B) allocation of seats in the Council of States.
The Fourth Schedule to the Constitution of India deals with the allocation of seats for each State and Union Territory in the Rajya Sabha (Council of States), which is the upper house of the Parliament of India.
– Option A (provisions related to the administration of tribal areas): This is primarily dealt with in the Fifth Schedule (for Scheduled Areas and Scheduled Tribes across several states) and the Sixth Schedule (for tribal areas in the states of Assam, Meghalaya, Tripura, and Mizoram).
– Option C (the Union List, the State List and the Concurrent List): These lists enumerating the subjects on which the Union and State Governments have legislative powers are found in the Seventh Schedule.
– Option D (recognized languages of the Union of India): The officially recognized languages of India are listed in the Eighth Schedule.