Sensex was down 609.68 points to 85,102.69 while Nifty fell 225.90 points to 25,960.55 on Monday, with 47 out of 50 sectors closing in red. Further, BSE-listed companies collectively erased nearly ₹7 lakh crore in market capitalisation, reported CNBC-TV18. Tech Mahindra was the biggest gainer with 1.22% increase, while IndiGo plummeted 8.62% amid massive flight cancellations.