(a) for th e avidance or relief of double taxation with respect to gift'- tax payable under this. Act and under the corresponding law in force in the reciprocating country, or

(b) for exchange of information for' the prevention of eva- sion or avoidance of gift- tax chargeable under this Act or under the corresponding law in force in that country or investigation of cases of such evasion or avoidance, or

(c) for recovery of tax under this Act and under the corresponding law in force in that country, and may, by notification in the Official Gazette, make such provision as may be necessary for implementing the agreement.] Explanation.- The expression" reciprocating country" for the purposes of this Act means any country which the Central Government may, by notification in the Official Gazette, declare to be a reci- procating country.