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  1. M

    Chemistry: Post your doubts here!

    I was going for that too but it's D.
  2. M

    Chemistry: Post your doubts here!

    4. A: D without a charge has 1 proton and 1 neutron and 1 electron. D- would have 1 proton 1 neutron 2 electrons, so it has more electrons than protons but not more protons than neutrons. B: H3O without a charge has 10 protons 10 electrons and 8 neutrons, with + charge it loses 1 electron and...
  3. M

    Chemistry: Post your doubts here!

    Guys what's going on in this one?
  4. M

    Chemistry: Post your doubts here!

    Haha good luck to you too man I really hope we do! Have a goodnight, I'll be up! :D
  5. M

    Chemistry: Post your doubts here!

    Ikkk same, like today there was no EPG lol
  6. M

    Chemistry: Post your doubts here!

    3. R to S is -134 S to R is +134 S to U is +92 U to S is -92 U to T is -75 T to U is +75 Statement 1: U to R = U to S + S to R = -92 + 134 = +44 so it's true Statement 2: T to S = T to U + U to S = +75 + -92 = exothermic, not endothermic Statement 3: Knowing that 2 is incorrect and 1 is...
  7. M

    Chemistry: Post your doubts here!

    Hmm yeah these are good formulae but there are exceptions so I just do the counting on the spot lol and I leave isomers for the end so that's a major tip. Skip isomer questions. Do em at the end. XD
  8. M

    Chemistry: Post your doubts here!

    2. Both exist as solid lattice. You should know that I2 is a solid molecular lattice, google it. But you can also get A by eliminating the other incorrect options. It can't be B cause SiO2 is a giant molecular structure, not simple. It can't be C cause CO2 has double bonds. It can't be D cause...
  9. M

    Chemistry: Post your doubts here!

    1. It's B cause when the HBr is eliminated and C=C forms, the second C (the one which had the Br) can either form a C=C with the C to its left (the first C), OR form a C=C with the C to its right (i.e., C=C between 2nd and 3rd C). This is 2 structural isomers. Then for the C=C in the middle...
  10. M

    Chemistry: Post your doubts here!

    3 guys from my batch said 2015 Paper 12 is hard and they got 27-28 ish, give it a shot. I'll give it a try too.
  11. M

    Chemistry: Post your doubts here!

    1 is true cause of the COOCH3 branch, it's an ester, so H2SO4 will hydrolyze it. 2 is true cause again, COOCH3 is an ester, alkaline hydrolysis of esters will occur due to NaOH. 3 not true cause no open OH or OOH with which sodium metal can react.
  12. M

    Chemistry: Post your doubts here!

    Classic.
  13. M

    Chemistry: Post your doubts here!

    Yeah man awesome notes and tips. This came especially in here. A hard question for anyone unless one knows this equation and the cold one too which is
  14. M

    Chemistry: Post your doubts here!

    Damn. I talked to a friend (absolute genius) and he pointed out that it's perhaps cause CO doesn't get oxidized in the atmosphere. Which would make sense cause normally you see that when CO is produced, it like, remains in the air ya know. It harms us and stuff. Unlike NO which we do in paper 3...
  15. M

    Chemistry: Post your doubts here!

    As zellyman said, P is same in both so in first situation: P = nRT/V You don't know n but you do know that n = mass/Mr and you have mass so substitute that in, convert T from C to K, convert V from 0.025 to 0.000025 if you want and R is 8.31 as you know, but keep V in dm^3 anyway cause units...
  16. M

    A level Biology: Post your doubts here!

    Haha yes I am! Oh wow, I said "No" to maths the day I finished my O Level in Math and got an A* lol. I'm from CIE timetable of Zone 4, variants 12, 22 etc. :p
  17. M

    Chemistry: Post your doubts here!

    Beautifully explained. LOL I'm here relying on hard questions by you guys XD
  18. M

    A level Biology: Post your doubts here!

    IA = InshaAllah abbreviation lol Yeah I got chem tomorrow then physics the day after tomorrow, thanks a lot! You got any?
  19. M

    Chemistry: Post your doubts here!

    Answered this for another user on here. Here is what I wrote: Okay so in pentane we have CH3CH2CH2CH2CH3. What came to my mind first was, will it only occur at the terminals (-CH3) or in the middle too? I concluded that it occurs in the middle too by looking at the options. First option is 2...
  20. M

    Chemistry: Post your doubts here!

    Haha thanks man but after bio, *sigh* lol anything can happen. Let's just hope tomorrow goes well. I can't afford to lose more than 2 marks tomorrow cause p4 and p3 went bad and need 3 A*s :(
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