Mid Day Mood At Dalal Street: Wipro Dips on $375M Deal; NTPC Green, Texmaco Rally; Apollo Sells Stake; Vikram Solar & Gem IPOs Hot; Titagarh Drops; GMR Raises Rs 1,600 Cr Debt

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Sensex drops 540 pts; Nifty below 24,950 as market waits for Jerome Powell's Jackson Hole Speech.