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  1. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    We replied by a mere difference of nano seconds. :D
  2. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    The answer is A since all the other options are also properties of ordinary acids. ONLY organic acids react with alcohols to form esters.
  3. Saad Mughal

    :)

    :)
  4. Saad Mughal

    Yeah, that's what STEEPER means. Steep means that higher gradient, which means that it is...

    Yeah, that's what STEEPER means. Steep means that higher gradient, which means that it is similar to a straight line in the beginning then it stops at the same final volume but at t=28 s.
  5. Saad Mughal

    A2 (d) Increasing the concentration means increasing the speed. The concentration is doubled...

    A2 (d) Increasing the concentration means increasing the speed. The concentration is doubled hence the speed is doubled. The reaction first ended at 56 s. Now it will end at 28 s. The Volume will remain same since the mass of calcium carbonate is same. Draw another curve that is steeper than...
  6. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    :)
  7. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    For questions like 3, where you have a reaction with which you are not familiar. Try elimination. Let's discuss this shall we, For option A, Zn + 2HCl --> ZnCl2 + H2, Hydrogen won't change the colour of the litmus so option A rejected. For option B, Na2CO3 + 2HCl ---> 2NaCl + H2O + CO2, Carbon...
  8. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Examiner reports are there. Not mark schemes. Examiner reports have the answers if you want it here it is: http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Chemistry%20(5070)/5070_s03_er.pdf
  9. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    They tell us to draw the image of X. We can directly draw rays from X, reflect them, trace them back to find the image. No need for eye.
  10. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Don't know about the year. :confused: But it's correct to make the eye. No penalties for that.
  11. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    If relative velocity does come, it can range around 6-10 marks and depending on the ease of the paper, you're A* could well and truly be still possible. However, you shouldn't just give up. Here's a playlist, search for the relative velocity videos from here and watch them. They'll help...
  12. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Well, if someone doesn't understand. Just ask us to translate. :) We would never use Urdu for answering questions. It's solely for conversation purposes SOMETIMES.
  13. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Curse.
  14. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah yeah. I know it's miserable.
  15. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Well, it wasn't referred to you. That's why I used urdu. Still, I said: 'Hey. Emotional Lalay (I have no alternate for this). Nobody's saying anything serious to you, they're kidding, don't get serious.'.
  16. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Aluminium has the coating of oxygen (it becomes Al2O3) which makes it inert.
  17. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    I try. :P
  18. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    The drawing's really really pathetic. I'm no good at paint. I know sorry. :( I hope you get the concept. P.S. I switched one of the arrows accidentally too. :p
  19. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Oye. Emotional lalay. Koe kuch nhi keh rha. Sb mazaq kr rhy hain. :p
  20. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Why in the world would he give you a bud'du'a. He was just telling you to appreciate peoples' efforts. Don't worry over it. :)
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