Jammu and Kashmir Requisitioning and Acquisition of Immovable Property Act, 1968 : Sections 7, 8, 16 and 21, Land-Requisition and Acquisition by State at the instance of Union of India-Competent Authority-Determination of Market Value by Union of India-Whether has right to associate with Competent Authority-Approval of compensation by Union of India-Whether necessary-Union of India whether has Locus Standi to object to the compensation-Arbitrator ap-pointed under the Act--Whether has power to award Interest and solatium.