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  1. M

    Chemistry and Physics AS paper 12 MCQS

    You're welcome. Examiner report clarified that for me.
  2. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Atomic crystal are metals and those have very high boiling points. This has boiling point of just over 100 so it has to be Molecular crystal.
  3. M

    Yes I am from BSS Hyderabad. Do I know you?

    Yes I am from BSS Hyderabad. Do I know you?
  4. M

    Chemistry and Physics AS paper 12 MCQS

    1 cannot be as molecules have to join. The molecules can join in any fashion so it can be any number less than 1.
  5. M

    Chemistry and Physics AS paper 12 MCQS

    Thanks!
  6. M

    Chemistry and Physics AS paper 12 MCQS

    Can someone explain this to me? I have done all the calculation but answer is coming different. Summer 2011, Variant 13, Q12. My calculation Al2O3 + 6HCl = 2AlCl3 + 3H20 As 1 mol of Al2O3 reacts with 6 mol of HCl, 0.02 mol react with 0.12 mol. 0.12/2= 0.06 dm3 of HCl 60 cm3. Whats wrong with this?
  7. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Can someone explain this to me? I have done all the calculation but answer is coming different. Summer 2011, Variant 13, Q12. My calculation Al2O3 + 6HCl = 2AlCl3 + 3H20 As 1 mol of Al2O3 reacts with 6 mol of HCl, 0.02 mol react with 0.12 mol. 0.12/2= 0.06 dm3 of HCl 60 cm3. Whats wrong...
  8. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    B and C can be easily eliminated. The answer is D or A? And can you please tell me the year and number of this question?
  9. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    How can 3 different versions of X be formed? I can only count 2 different versions. Summer 2010, Variant 12, Q25.
  10. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Can someone explain Q22 to me please? Summer 2011, Variant 12. How does SOCl2 give the best yield? Why wouldn't NaCl?
  11. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Q18: It says that when it was heated without any air so no compound was added or removed from the Ammonium Cynate. Only the addition of CNO will balance both sides Ammonium will be Nh4. The compound was NH4CNO Q20: I have no idea about that. Q22: Hydration and oxidation all occur at the double...
  12. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    How can 3 different versions of X be formed? I can only count 2 different versions. Summer 2010, Variant 12, Q25.
  13. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    I think you're wrong because we do use K2Cr2O7 to oxidise alcohols and aldehydes to Carboxylic acids.
  14. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Why can we not oxidise this compound? It has OH group so it should be oxidised which is written in 2. Summer 2005, Q39.
  15. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Electronegativity increases with decreased ionic radius. So as we go across a period electronrgativity increases. Down a grp electronegativity decreases.
  16. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Oh thankyou so much! Was mising the cis-trans isomer!
  17. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Check the second step. When CH3CHO converts to CH3CH(OH)OCH2CH3. Aldehydes and Ketones go through Nucleophillic Addition so Neuclophillic addition is involved.
  18. M

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Can some please explain Winter 2005 Q24 to me?
  19. M

    S1 Urgent Help Needed

    Thanks!
  20. M

    Physics P4 and Maths P6,, lets study together in these final moments :P

    I need some help please. November 2011, 61, Q7 part 3. 7. Bag A contains 4 balls numbered 2, 4, 5, 8. Bag B contains 5 balls numbered 1, 3, 6, 8, 8. Bag C contains 7 balls numbered 2, 7, 8, 8, 8, 8, 9. One ball is selected at random from each bag. (i) Find the probability that exactly two of...
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