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can any one help me in
chemistry 9702 p11 (variant 1) oct nov 2012 question 4 (9701/11/O/N/12 q4)
http://freeexampapers.com/A-Level/Chemistry/CIE/2012-Nov/9701_w12_qp_11.pdf
chemistry 9702 p11 (variant 1) oct nov 2012 question 4 (9701/11/O/N/12 q4)
http://freeexampapers.com/A-Level/Chemistry/CIE/2012-Nov/9701_w12_qp_11.pdf