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hmm..nt sure abt 11 n 13http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s09_qp_1.pdf
Q11 Why cant answer be D
Q13 What to do in this?
Q31 How can radius be same?
Q34,Q35,Q37
31 is easy though.. since Carbon n Cl r in d same period, they hv d same no. of shells, n so the radius of both r the sme, whreas d othr properties dnt match up, so D