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  1. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    He's just telling you that even things like that happen.
  2. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Actually, you'll get the full marks (unless you don't show proper working), this is because when the answer is correct, the examiner checks the working and marks it. Since, logically and sensibly, our working is CORRECT, we will get the marks. CIE doesn't deprive their candidates of marks this way.
  3. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Actually no, errors do appear in mark schemes over the years, the examiner doesn't just blindly check the papers, he goes through them and there is obviously a mistake in the MARK SCHEME and not the answers of the candidates. So, don't worry. :)
  4. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    You do know that CIE is managed and run by HUMANS, don't you? :p Besides, this is a minor mistake (in the method mark), I've seen mistakes in answers. :p
  5. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Yeah, CIE has made a mistake. :p You can see the answer, 06 50 can only come if you make the proper conversions (25 min. would come) and then subtract from 07 15. The examiner would have noted this while checking obviously.
  6. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Oh yeah, obviously. Apologies for the error.
  7. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Margarine is an alkane (saturated compound). Vegetable oil is an alkene (unsaturated compound). When an alkene is hydrogenated it forms an alkane. Hence, the answer is B. Also, options A and D are horribly incorrect, bromine gas is not colored but decolorized by alkenes and alkenes have double...
  8. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Lengthy. :( BAC = 90 Calculate BC using Pythagoras theorem, Apply sin BCN = BN/BC to get angle BCN (13.8 deg.) For (ii), Calculate BD using BD=BN/sin BDN, BD = (164 approx.) Apply cos DBA = AB/BD (50.8 deg.) Sorry, couldn't give full solutions, they're lengthy. o_O
  9. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    C and D will be vigorous reactions, we can't react them safely. B is not possible (for forming KCl), the reason being that Sulphate ions are more stable and reactive than Chloride ions hence the Potassium ion prefers to be with the Sulphate ion rather than the less stable chloride ion therefore...
  10. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Yes, neutralization occurs whenever a salt and water are formed (on reaction with acid of course).
  11. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    The answer for 20 is C. The oxide of the element X is a catalyst. We know that most catalysts are from the transition metals, so among the 4 options, either D or C are transition elements, A is argon and B is magnesium. C is Manganese and is the answer since Lead (D) oxide and dioxide are good...
  12. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Oh sorry. That is 7+9 to show that the 16th term is the maximum for a median of 1.
  13. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Since the mode is 1 (frequency 9), the largest value of x would be 8 (less than 9 so that 1 is still the mode). When the median is 1, the largest value of x would be when the median is at 16th term (7+6), so, Applying Median formula (n+1/2) Median = 7+9+3+x+1/2 th term 16 = 20+x/2 32 = 20 + x...
  14. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    We won. Yay! :p TheStallion-Reborn
  15. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Let's just see what the answer is then. :D
  16. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    These are double transformations. One transformation followed by another. Past papers mostly consist of questions to describe double transformations as single transformations. If you want to practice then the D-series of Mathematics has this, I think; this is part of the transformations chapter...
  17. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Oh please. :p I've been hearing this since class VII. :cool: Never once have I bothered listening.
  18. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Wow. You're brilliant :p
  19. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    The key again. I directly went to this part and did not even see the circuit diagram! READ QUESTIONS PROPERLY. Whoever said that was a genius.
  20. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    I think I've got it, The LED has a potential difference of 1.7 V, The e.m.f. is 9 V, The resistor hence has a potential difference of 9-1.7=7.3 V, Minimum Resistance = 7.3/0.025 = 292 ohms.
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