Which is the correct form of the top operating lines for continuous distilation of a binary mixture, wijare trays are numbered from the top downwards? D. A. Yn-1 Vn-1 Vn-1 D. B. Vn-1" V-1 Vn-1 D xO Va+1 La C. Vn+1 Vn+1 D. OD. Vn+1 Vn+1 Vn+1

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