Hey I was confused about the conductivities, too. i just wrote that Ba ion is more ionic, as it was 1 mark..
And I read a couple of posts about the phys 3b paper, and u people gave the first MC Question 20m? I gave 2000micro, i did some calculations and the current came as .027A, so if we want to get a proper current reading, we should go for the one which goes upto .002, i.e. 2000micro, which would give a reading of the .027A properly.
And did anyone give bio u3b? I couldn't ans. the 4 marks about changing the bibliography...