Sec. 58(f) of Transfer of Property Act lays down as follows:
"Mortgage by deposit of title deeds.-
Where a person in any of the following towns, namely, the towns of Calcutta, Madras, and Bombay and in any other town which the State Government concerned may, by notification in the Official Gazette, specify in this behalf, delivers to a creditor or his agent documents of title to immovable property, with intent to create a security thereon, the transaction is called a mortgage by deposit of title- deeds.
Therefore you have to verify the Official Gazzette Notification of Kerala State Government where the immovable property is situated and confirm if the particular place where the immovable property is situated is added in such Notification not.
If you put in efforts to find out the above, I think you can form your own opinion .