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  1. Suchal Riaz

    Physics: Post your doubts here!

    if you have any doubt in potentiometers then please read coursebook it explains everything very nicely. for this question: now there is less p.d across wire, so less p.d per unit length. it means that more wire will be enough to balance the same emf of battery.
  2. Suchal Riaz

    Physics: Post your doubts here!

    good luck for tomorrow. sorry for not helping you guys today. i was hanging out with my friends. trying to chill out :P
  3. Suchal Riaz

    Physics: Post your doubts here!

    17: power = total energy / time = Ep+Ek / t 40: k-capture is opposite of Beta decay. it means that its mass will remain same but it's proton number will increase
  4. Suchal Riaz

    :""(

    :""(
  5. Suchal Riaz

    Formulae for AS physics (Short Revision Before Exam)?

    They are written on the first two pages of paper :P
  6. Suchal Riaz

    enthalpy wale mein 20 minute zaya. baqi jaldi jaldi kiya kaafi saray jaldi mein ghalat :"""(

    enthalpy wale mein 20 minute zaya. baqi jaldi jaldi kiya kaafi saray jaldi mein ghalat :"""(
  7. Suchal Riaz

    bad paper :'(

    bad paper :'(
  8. Suchal Riaz

    Chemistry: Post your doubts here!

    If you thought that i would go away without helping sorry to disappoint you ;)
  9. Suchal Riaz

    Chemistry: Post your doubts here!

    i don't understand your question. what is for and what is x2/4(b-x)2
  10. Suchal Riaz

    Chemistry: Post your doubts here!

    sorry wrong answer. correct answer is that as the molecular formula shows that there are 4 carbon and 10 hydrogen, it must be an alcohol as any C=O will decrease the number of hydrogen by 2. it has general formula CnH2n-2O. ketones/aldehydes have formula CnH2nO
  11. Suchal Riaz

    Chemistry: Post your doubts here!

    it can be aldehyde or ketone. both contain only one C=O
  12. Suchal Riaz

    Chemistry: Post your doubts here!

    I can't solve any doubts now. i have made many mistakes in solving the doubts which indicate that sleep has overtaken me and i am not able to help you guys without misguiding you. Have an excellent paper tomorrow :P May the odds be in your favour :P :LOL:
  13. Suchal Riaz

    Chemistry: Post your doubts here!

    Jim Clark : author of "chemistry calculation for As and A level" and of ChemGuide.co.uk
  14. Suchal Riaz

    Chemistry: Post your doubts here!

    a very interesting question. in graphene/graphite all CC bonds are not single bonds. they are neither double bonds. it like one p-orbital free electron a double bond for all of the six bonds. in the data booklet you will find "C=C(benzene)" value. it is much higher than C-C. each bond in...
  15. Suchal Riaz

    Chemistry: Post your doubts here!

    it is a bad day isn't it. Ag is solid. how can we find it's concentration? sorry for that. Ag is solid. we don't consider solids
  16. Suchal Riaz

    Chemistry: Post your doubts here!

    omg i am sorry. it was distilled. it means that the dissolved salts will be separated.
  17. Suchal Riaz

    Chemistry: Post your doubts here!

    there are 0.44 mol of Ag+ so there are 0.44 mol of Fe2+ it means out of 1 mol o.44 remain, rest of them have been converted into Ag and Fe3+ so there are 1-0.44=0.56 mol of Fe3+ and 0.56 mol of Ag Kc=0.56*0.56 / 0.44*0.44 = 1.62
  18. Suchal Riaz

    Chemistry: Post your doubts here!

    C=O | O it is ester group. when it will hydrolyse in NaOH it will make --CO2- Na+
  19. Suchal Riaz

    Chemistry: Post your doubts here!

    have you any idea of what are you saying? what do you mean by this:
  20. Suchal Riaz

    Chemistry: Post your doubts here!

    you are such a liar. you always solve all doubts and pretend like you know nothing
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