What happens if the exchange rates are the same?

Order splitting would be done with an exchange that has more quantity if the prices for any scrip are equal.

Illustration

Market Depth


BSE    NSE
Qty    Rate    Qty    Rate
200    100    100    100
300    101    600    101

Order: Purchase 500

200 BSE quantities available at the best price of 100

100 quantities of NSE are available at the best price, 100

200 NSE quantities available at the best price of 101

300 quantities in NSE and 200 in BSE