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  1. Z

    Chemistry: Post your doubts here!

    I think its D Draw the chain first,you can see that the ammoniacan first react with the C-Br bonds of the 1st carbon and that of the 5th carbon (in the straight chain) which forms the ring as shown. Sorry if I'm being unclear >_<
  2. Z

    Chemistry: Post your doubts here!

    I guessed something of the sort,its its still an ill demeanor to give us questions as such,since from our O levels we know that CO is a powerful reducing agent and so there is still a possibility of it being oxidised in the atmosphere.
  3. Z

    Chemistry: Post your doubts here!

    Hydrolysis of the ester bond by dilute Sulfuric acid or Sodium hydroxide is possible ^_^
  4. Z

    Chemistry: Post your doubts here!

    Solves this ,A friend gave it to me to tell him why,and I honestly have no idea C is the answer
  5. Z

    Chemistry: Post your doubts here!

    P decomposes to form R at a 1:1 ratio If X moles of R are formed X moles of P decompose
  6. Z

    Chemistry: Post your doubts here!

    I did some working and some deduction, You have to calculate for each of them and see if they match If D is correct,2 moles of P decompose to give x moles of R in a 1:1 ratio Q :R forms in a 1:2 ratio Hence you can put the following equation 2- x (decomposition) + x (R) + 1/2 x (Q) = 2 + 1/2 x
  7. Z

    Chemistry: Post your doubts here!

    is the answer D ?
  8. Z

    Chemistry: Post your doubts here!

    For the 1st one there is 1 lone pair and 2 bond pairs so a near trigonal planar shape would be formed if including the lone pair.The bond angle is hence 120 degrees For the 2nd one change in oxidation in each Cr ion is -3 ,as two Cr ions are oxidized a total change of -6 is observed,as the...
  9. Z

    Chemistry: Post your doubts here!

    Do you still need the answers or did anyone inbox you?
  10. Z

    Chemistry: Post your doubts here!

    Give us some hard questions Metallic :P
  11. Z

    Chemistry: Post your doubts here!

    A more proper way to represent these carbonates is in the form of BaCO3.CaCo3 CaCo3 is common in all three of these,so the rest must be categorized in order of how much CO2 would be released on decomposition Mg3(CO3)3 would release more CO2 than just MgCO3 and that in turn would release more CO2...
  12. Z

    A level Biology: Post your doubts here!

    then again in darks' 2nd example they've given a graph of what you suggested.CIE needs to be more careful with these things.
  13. Z

    A level Biology: Post your doubts here!

    What I don't understand is why Venules have such high cross sectional area ._.
  14. Z

    A level Biology: Post your doubts here!

    DNA Unwinds---------->Bonds broken once Bonds form between complementary bases of the DNA sense strand and mRNA strand being formed ----->Bonds formed once Once mRNA is formed bonds are broken again --------> Bonds broken twice DNA strands reform complimentary base pair bonding ------->Bonds...
  15. Z

    A level Biology: Post your doubts here!

    Can someone Explain Active Loading and unloading to me,including everything about the water potential?
  16. Z

    The answer is B which is 3.4 ,because out of the 4 diseases only 2 are Viral, Measles and...

    The answer is B which is 3.4 ,because out of the 4 diseases only 2 are Viral, Measles and HIV/AIDS .Add the death count for those and you should get 3.4 .
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