If you place a BUY order and SELL order same time of a perticular stock, in 2 different account with 2 different brokers, order will be rejected by NSE by saying it is "Self Trade"?

 Yes, placing a BUY order and SELL order for the same quantity of a particular stock at the same time, in two different accounts with two different brokers, will be considered as a "self-trade" by the stock exchange, and the order may be rejected. This is because a self-trade involves the same entity buying and selling the same security simultaneously, which can be used for market manipulation or insider trading purposes.

The National Stock Exchange of India (NSE) has implemented self-trade prevention checks to prevent such practices. If two orders from the same client ID match with each other on the exchange, the system can identify it as a self-trade and reject one or both of the orders.

It is also important to note that self-trading is prohibited by most stock exchanges globally and can lead to penalties or legal action against the parties involved.