The Nifty 50 index opened at 25,333.75 on Sunday hours before the presentation by Finance Minister Nirmala Sitharaman in Parliament today at 11 am, registering a marginal gain of 13.10 points, or 0.05 per cent, while the BSE Sensex opened at 82,445.97, up by 176.19 points, or 0.21 per cent.

