Zinc futures dropped more than 2% in the opening session of the MCX today (October 22).Zinc October 2008 contract opened at Rs 56.60 per kg as compared to its earlier closing of Rs 57.20, it tossed in the range of Rs 55.65-56.60 and was last traded at Rs 55.75, down 2.53% (10.32 a.m., Wednesday).Zinc November, 2008 contract opened at Rs 59.15 per kg as compared to its previous closing of Rs 59.60. The last quoted price for the same was Rs 58.20, down 2.35% and Zinc December, 2008 contract de