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  1. D

    Biology; Chemistry; Physics: Post your doubts here!

    According to the revision checklist, it's simple sugars.
  2. D

    Biology; Chemistry; Physics: Post your doubts here!

    All of the hydrocarbons can produce carbon if they are burned in a very limited supply of oxygen. Carbon monoxide doesn't do that.
  3. D

    Biology; Chemistry; Physics: Post your doubts here!

    The mcq about burning 1g of carbohydrates, it was the first one, right?
  4. D

    Biology; Chemistry; Physics: Post your doubts here!

    That one is used in purification of copper and it doesn't generate electricity ( You have to provide electricity).
  5. D

    Biology; Chemistry; Physics: Post your doubts here!

    idk... in past paper 2s it always asked why solid NaCl doesn't conduct.
  6. D

    Biology; Chemistry; Physics: Post your doubts here!

    Was option B the one with NaCl electrolyte?Because that was solid. :p
  7. D

    Biology; Chemistry; Physics: Post your doubts here!

    You had to count the inner ones too because 'all' was written in bold. And it doesn't matter if they were below H.
  8. D

    Biology; Chemistry; Physics: Post your doubts here!

    Electricity will be generated because of the different reactivity of metals.
  9. D

    Biology; Chemistry; Physics: Post your doubts here!

    How many alcohols were there in the MCQ?
  10. D

    Biology; Chemistry; Physics: Post your doubts here!

    That's the correct option. I know because it was from a past paper.
  11. D

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah. When reducing agents like KI get oxidized due to potassium dichromate, there is a colour change.
  12. D

    Biology; Chemistry; Physics: Post your doubts here!

    Oxidizing an alcohol(T) gives a carboxylic acid(S). Potassium dichromate is an oxidizing agent.
  13. D

    Biology; Chemistry; Physics: Post your doubts here!

    Only alkenes undergo addition polymerization. B is carboxylic acid and C is ester.
  14. D

    Biology; Chemistry; Physics: Post your doubts here!

    This is just a recall question regarding reactivity series. Or you can get the answer from the fact that iron is reduced by carbon while aluminium is not. Yeah.
  15. D

    Biology; Chemistry; Physics: Post your doubts here!

    You do one of the four reactions: 1) Metal + acid 2) Metal oxide + acid 3) Metal carbonate + acid 4) Metal hydroxide + acid (titration) depending on the salt you want.
  16. D

    Biology; Chemistry; Physics: Post your doubts here!

    Temperature Increase: Forward in endothermic. Backward in exothermic. Pressure: Increase will shift equilibrium towards less moles. Decrease will shift it towards more moles. When you add more reactant or increase the conc. of reactants, it will move forward and opposite when you do the same...
  17. D

    Biology; Chemistry; Physics: Post your doubts here!

    Calcium sulfate is insoluble. To prepare an insoluble salt, both reactants must be soluble and that's only the case in B.
  18. D

    Biology; Chemistry; Physics: Post your doubts here!

    A is correct because they can be inorganic (e.g Iron) or organic ( e.g enzymes) B is wrong because catalysts do take part in a reaction (but are unchanged at the end) C is wrong because it can speed up both forward and backward D is wrong because it does not provide the activation energy, only...
  19. D

    Biology; Chemistry; Physics: Post your doubts here!

    Everyone did.
  20. D

    Biology; Chemistry; Physics: Post your doubts here!

    lol this took me by surprise too until someone explained air contains 79% N2 so it will be in the test tube.
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