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  1. I

    HELP!!!!!!!

    Can you please explain Mcq's 18,22,25,26,28 and 40 from may june 2003...i would be grateful.
  2. I

    Chemistry P 2 Guesses

    I never said it was form a reliable source and well its a guess...i got it from somewhere so i shared it.
  3. I

    Chem paper 1 2005 doubts :D

    You are welcome :)
  4. I

    Chem paper 1 2005 doubts :D

    For M.C.Q 15: make the equation: 2Ca(NO3)2 ---------> 2CaO + 4NO2 + O2 the moles of calcium nitrate= 8.2/164 = 0.05 hence moles of oxygen= 0.025 moles volume of oxygen= 0.025 * 24000 = 600 cm3 and youre done :)
  5. I

    Chem paper 1 2005 doubts :D

    M.C.Q 16: For the limewater turning milky we need a carbonate and later in its remaining part a metal which produces hydrogen with the acid..I n which case the option is C with barium as a metal.
  6. I

    Chem paper 1 2005 doubts :D

    For M.C.Q 24: I guess you just have to make an alkene out of each alcohol and make its isomers...three isomers are only possible in case A of butan-2-ol.
  7. I

    Chem paper 1 2005 doubts :D

    For M.C.Q 36 Option 1 is correct since in NaClO3 the oxidation state of clorine is +5 Option 2 is also correct since the chlorine has two oxidation states in the products -1 and +5 Option 3 is incorrect since chlorine acts as the reducing agent since it oxidises itself. Hope it helps! :)
  8. I

    Chem paper 1 2005 doubts :D

    For M.C.Q 15 May June 2005: Concentrated sulphuric acid is powerful enough to oxidise HBr to Br2 and Iodine to I2 however it isnt powerful enough to oxidise HF and HCl. Its a fact :)
  9. I

    Chem paper 1 2005 doubts :D

    For M.C.Q 7: Make the reaction route diagram firstly. I will try to make it here: 0.5 I2 + 1.5 Cl2 ----X----> ICL3 ICl + Cl2 X= -88 + 7 x= -81 We use seven since we need the energy per mole of ICl and the equation mentioned in question is for two moles. Hope...
  10. I

    Chem paper 1 2005 doubts :D

    For M.C.Q 2: For this question just look at the equation mentioned in the question for once, if one mole of NaN3 is available then it would form one mole of Na and 1.5 moles of Nitrogen, then that same one mole of Na will be used in the next equation, hence if it is one mole then the nitrogen...
  11. I

    Chem paper 1 2005 doubts :D

    Okay I can try to help you with the M.C.Q's one by one...for the M.C.Q 1 you should be aware of the fact that whenever a hydrocarbon is burnt the number of carbon atoms in that molecule are equal to the molecules of carbon dioxide produced, likewise the number of hydrogen atoms in the compound...
  12. I

    Chemistry Paper 1 !!!

    Thank you so much!!! :)
  13. I

    Chemistry Paper 1 !!!

    Can anybody please explain M.C.Q 21 and 22 from October November 2008? I t would be of great help..
  14. I

    Chemistry P 2 Guesses

    Organic tricky question Large question on Hess Law Look upon questions from may-/june 2000 1,2,3 and 4 along with 1998 question 4 Balancing redox equations Fuel cell Questions on moles Thats all I know..but i dont have the past papers...:( anybody has a link to access them?
  15. I

    To those who princesszahra helped:

    please pm me too! i just joined recently...!!!
  16. I

    Got Everything Coming For Chem Paper 34! :)

    pm me please...i would be grateful!!
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