Sensex up 234pts, Nifty firm; Infosys up 3% ahead of Q2 nos

Sensex up 234pts, Nifty firm; Infosys up 3% ahead of Q2 nos Coal India, Maruti, BHEL, Sun Pharma and HUL were laggards in the Sensex. Infosys was up 3 percent ahead of its Q2 earnings.