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2003 - Multiple Choice - Q1,4,5,11,25,27 any help appreciated


Posted 24 May 2006 - 05:17 PM

hi, it will be handy if you have past papers.

the Qs are 1,4,5,11,25,27.

any help will be appreciated.



Posted 24 May 2006 - 05:35 PM

1. Revision of SG really. You should remember that argon will never conduct cause it's a group 0 element. Potassium is a metal, so it will conduct whether solid or molten. Tetrachloromethane is completely non-metal, so it won't conduct, which leaves only potassium fluoride which won't conduct when solid, but will when it's molten as there are free electrons.

Answer C

4. Dunno :S

5. NaCl has 0.6mole chlorine and therefore 0.6mole sodium
Na2SO4 has 0.2mole sulphate and therefore 0.4 mole sodium

total sodium = 0.4 + 0.6 = 1.0

Answer D

11. Dunno

25. dunno but you can rule out D because ammonia is alkaline and carboxylic acid is not

27. Dunno

Sorry i couldn't have been of any more help


Posted 24 May 2006 - 05:58 PM

4. Nitrogen exists as N2 so you just have to work out the number of combinations that those 2 isotopes can form. There are 3 so the answer is C

11. If you look at the bonding present you can work out the answer must be D.

25. Im not so sure about the chemistry of it but id go for A as it is the only one of the 4 options which contains nitrogen(the ammonia solution contains nitrogen).

27. The fatty acids can react where an OH group is present. There re 8 OH groups therfore answer is C.

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