Roller coaster ride for Sensex

The stock market turns volatile, reacting sharply to the Union Budget for 2007-08. Track Sensex

The stock market reacted sharply to Finance Minister P Chidambaram's Budget for 2007-08, as the benchmark Sensex tanked over 529 points to again slip below the 13,000 level.

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The wide-based NSE index Nifty plunged by 132 points at 3,762.05.

Even before Chidambaram finished announcing tax proposals, the market went into a free-fall reflecting investors disappointment at industry, particularly auto, not being given any relief.

All Sensex-related auto stocks, including Bajaj Auto, Hero Honda, Maruti Udyog and Tata Motors, were trading down.

The auto index was down about three per cent at 5,152 points.