Comment on Online pledging of stocks for trading F&O

I am Zerodha account holder. Please answer the below queries:

1) What is the minimum/maximum value of holding that can be pledged/unpledged?
2) You mentioned that 60/- per scrip, but in the example mentioned by you (Reliance and Infosys), 2 scrips are pledged. So, the total charges should be 120/- for pledging and 120/- unpledging
3) Does the value of the collateral varies everyday based on the underlying value of the pledged holdings ?

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