With Nifty, one can buy maximum 36 lots of same options (quantity freeze). Can a person buy 36 + 36 lots of same options with 2 different demate account with 2 different brokers?
First options do not go in to demat account.
Second order freeze applies to an order. If you are placing two orders with two different brokers then you can place 36 + 36 at a time.
Quantity freeze is not equal to maximum quantity you can buy it just means max quantity per order. You may place multiple orders with freeze quantity . Zerodha provides icebergs order where you can place 10 order at a time , so if you want to buy 360 lots in that sec interval you can place that( it will incur slippage though) using iceberg order