Mumbai, Jan 21 (Reporter) The BSE Sensex on Tuesday dropped 317 pts at 76,756 in the opening session as selling was seen across the board. The National Stock Exchange (NSE) slipped 81.45 pts to 23,263.30. Advancing over 400 pts in the previous session, the sensex was seen weak in early trade, as the sensex registered intraday highs and lows at 77,297.72 and 76,701.45 pts, respectively. The Nifty registered days high and low at 23,426.30 and 23,255.15 pts, respectively. The Mid cap eased 0.84% and the small cap by 0.66 pc. In 30 scrips, 11 advanced while 19 declined. The losers were Zomato by 8.45 pc to Rs 220.60, Adani Ports by 1.81 pc to Rs 1128.20, Reliance Industries by 1.36 pc to Rs 1289.26 and NTPC by 1.25 pc to Rs 331.85. The gainers were Ultracemco by 1.45 pc to Rs 10,778.65, HCL Technology by 0.62 pc to Rs 1806.80, Tata Motors by 0.59 pc to Rs 778.80 and ITC by 0.37 pc to Rs 439.35...////...