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  1. Metanoia

    Chemistry: Post your doubts here!

    Hi, please include answers to the questions so its easier to reply. s12qp13 Q11. Unless you can do them mentally, it might be advisable to adopt a trial and error approach to this question. Go from options A to D and see which one gives you the correct total moles of gases in the end I will...
  2. Metanoia

    Chemistry: Post your doubts here!

    w11qp11 Q4. There is 1 lone pair on the N atom. So we have 2 bond pairs and 1 lone pair, which is sightly below 120 degrees. Q17. Volatility has to do with intermolecular attraction. As electrons/protons increases, the instantaneous dipole- induced dipole gets stronger. Q20. Cold dilute Mno4...
  3. Metanoia

    Chemistry: Post your doubts here!

    Its nearly 9pm here. I think at most i would stay is till 11pm. Even so, i would only check in occasionally instead of staring at the CPU throughout. It there are too many questions, I might only focus on those that were not answered before, cause some questions are repeated, students can find...
  4. Metanoia

    Chemistry: Post your doubts here!

    Hi, please do include the answers to your questions. s07qp1 Q1. relative mass = 1/5 x 10 + 4/5 x 11 = 10.8 Q18. alkali gas is NH3. Fertiliser is NH4NO3. Empirical formula is N2H4O3 Q34. For mercury on right side to rise, the X flask create a higher pressure than before. Statement 1: (True)...
  5. Metanoia

    Chemistry: Post your doubts here!

    s04qp1 Q14. Al3+ is most polarising. Highest charge density will be most polarising (big charge/small radius) Q18. Use mole calcualtions to solve the amount of products, basing on 58.5 kg of NaCl 2NaCl + 2H2O --> H2 + Cl2 + 2NaOH
  6. Metanoia

    Chemistry: Post your doubts here!

    Hi, please include the answers for your respective questions to allow us to reply easier. s08qp1 Q31. Balance the equations below to see which 1 mol of substances require 2.5 mol of O2 C2H5OH + O2 --> CO2 + H2O C2H2 + O2 --> CO2 + H2O CH3CHO + O2 --> CO2 + H2O w08qp1 Q2 Q31. Statement 1...
  7. Metanoia

    Chemistry: Post your doubts here!

    ester bond broken by acidic hydrolysis --> alcohol and COOH group ester bond broken by alkaline hydrolysis --> alcohol and COO- group (carboxylate, not alkoxide)
  8. Metanoia

    Chemistry: Post your doubts here!

    s08qp1 Q27. Use the 4 options and trial and error. Before dehydration, the C=C bonds were actually CH-COH. Check which of the 4 could possibly give us a tertiary alcohol (resistant to oxidation) before dehydration. In this case, it was D.
  9. Metanoia

    Chemistry: Post your doubts here!

    For this question, all isomers, structural, geometric (cis-trans) and optical (chiral) have to be considered. Besides the 2-methylpropene the other 3 isomers are as mentioned by MaboroshI_I Its just that for C4H8, there is no chiral carbon, for we need no consider that part.
  10. Metanoia

    Chemistry: Post your doubts here!

    Can't guarantee that I would be able to do much, as its a working day.
  11. Metanoia

    Chemistry: Post your doubts here!

    You can refer to post 9680 https://www.xtremepapers.com/community/threads/chemistry-post-your-doubts-here.9859/page-484#post-823370
  12. Metanoia

    Chemistry: Post your doubts here!

    Is the answer C? The description means we have a mixture of carbonate 1) one which decomposes under heat to give CO2 (CaCO3) 2) one which does not decompose under heat, but later reacts with acid to give CO2 (BaCO3)
  13. Metanoia

    Chemistry: Post your doubts here!

    Q2. Removing products shift the equilibrium to the right, but does not increase the forward rate of reaction. Please see post #9494 for a sketch explanation. https://www.xtremepapers.com/community/threads/chemistry-post-your-doubts-here.9859/page-475
  14. Metanoia

    Chemistry: Post your doubts here!

    hydroxides more soluble down group sulfates less soluble down group
  15. Metanoia

    Chemistry: Post your doubts here!

    w12qp12 Q23 The molecule must be broken in two and 1) contain same carbon atoms 2) both parts must have isomers So this eliminates D, as 9 carbons molecule cannot form 2 smaller parts with equal carbons. Isomers from when hydrocarbon have 4 or more carbon, so minimum we must have 8 carbons in...
  16. Metanoia

    Chemistry: Post your doubts here!

    from 1 mole of monomer, the moles of polymer formed can be any number less than 1.
  17. Metanoia

    Chemistry: Post your doubts here!

    w05qp1 Q5. Least tedious method is to use data booklet and look at the the 2nd IE of A. Mg B. Al C. Si D. P You will see that Al has lower 2nd IE (1820) compared to the elements next to it on the Periodic Table, Mg (1450) and Si (1580) Q12. Examiners report said this question is withdrawn...
  18. Metanoia

    Chemistry: Post your doubts here!

    If 3 bond, 0 lone would be 120. If 2 bond, 1 lone, would be slightly below 120, still approximately 120 given the 4 options in the MCQ.
  19. Metanoia

    Chemistry: Post your doubts here!

    Nope, 2 bonds and 2 lone pairs will be around 104. Something like this 4 bond 0 lone = 109.5 3 bond 1 lone = 107 2 bond 2 lone = 104.5
  20. Metanoia

    Chemistry: Post your doubts here!

    Q6. need to make sure units are correct pV= nRT R = 8.31 T= 303K n= 0.56/28= 0.02 mol p= 120 000 Pa You can solve for v (in terms of m^3) Q7. Formation of propanone 3C (s) + 3H2 (g) + 1/2 O2 (g)--> C3H6O (g) heat of reaction = heat of combustion of reactants- heat of combustion of products...
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