Sorry it is
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_11.pdf
Q13, i don't how to get this, i have got volume as 60 cm3, how is it 30 cm3
M/J 2011
i think you used V=n*24 for finding volume instead of V=n/C