On the recommendation of which Commission/Committee, the Inter-state Council was set up in India?

In which one of the following years was Sarkaria Commission, which was empowered to recommend changes in Centre-State relations submitted its report?

Which one of the following is not related to Union-State relations in India?

Which one of the following taxes is not included in the Central Pool to be shared with the States according to the recommendations of Finance Commission of India?

What is the source of Inter-State councils?

Bihar is in the zone of which zonal council in India?