Yes, you can pledge your bonds as collateral for loans if they are on the list of Approved securities for pledging.
Not all mutual funds are eligible for pledging. You can connect with your bank or NBFC to check if your mutual funds are eligible for pledging.
Not all financial institutions or lenders may accept ELSS mutual funds as collateral. You will need to check with your lender or financial institution to see if they offer this option.
Margin is when a client borrows money from the broker to increase the purchasing power to trade. Now Margin Pledge is when the client has to commit (pledge) their securities to avail the margin required to trade.