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  1. Mathemagical

    Chemistry: Post your doubts here!

    The reactants will be used up and the rate decreases.
  2. Mathemagical

    Chemistry: Post your doubts here!

    C is an ester. It will not react with HCN.
  3. Mathemagical

    Chemistry: Post your doubts here!

    That is true, but that is not always the case. Take, for example, CFClBr. This molecule has 4 different groups on a single carbon but no structural isomers.
  4. Mathemagical

    Chemistry: Post your doubts here!

    The answer is B. When heated strongly, both carbonates will decompose into their respective oxides and carbon dioxide. Option 1: Magnesium oxide is a well-known refractory material. This is correct. Option 2: Both oxides are basic, so they will react with acidic impurities. This is correct...
  5. Mathemagical

    Physics: Post your doubts here!

    Area = π*R² Area 1= π*0.5² =π*0.25 Area 2 = π*0.25² =π*0.0625 Area 1 = 4* Area 2 Since Volume is constant, L is 4 times. Resistance is 4*4 times 0.2, which is 3.2.
  6. Mathemagical

    Chemistry: Post your doubts here!

    It will not necessarily have structural isomers.
  7. Mathemagical

    Chemistry: Post your doubts here!

    Reaction 3 would not occur because only carboxylic acids react with hydrogencarbonates.
  8. Mathemagical

    Chemistry: Post your doubts here!

    They do not want the bond angle of Cl2, instead it is the bond angle of CH4 you should find. Since chloroethanes are formed, there is no change in the bond angle.
  9. Mathemagical

    Chemistry: Post your doubts here!

    Sulphuric acid is such a strong oxidising agent that it would oxidise hydrogen astatide into astatine.
  10. Mathemagical

    Chemistry: Post your doubts here!

    The pi bond will be broken, so the new bond would be weaker.
  11. Mathemagical

    Chemistry: Post your doubts here!

    There is a double bond to the right. Upon addition of hot KMnO4 a ketone will be formed.
  12. Mathemagical

    Chemistry: Post your doubts here!

    The bond energies are weaker and therefore are easier to break under the influence of heat.
  13. Mathemagical

    Chemistry: Post your doubts here!

    The secondary alcohol group on the left will be oxidised to a ketone group, so there will be one less chiral centre.
  14. Mathemagical

    Chemistry: Post your doubts here!

    This question involves trial and error and balancing equations. It could be 1:4, but then the molecule would have a lot of carbon atoms and is not included in the options available.
  15. Mathemagical

    Chemistry: Post your doubts here!

    I'm not too sure about this myself, but there are 2 products which are hydroxides and if the pH were 14 there would be a greater concentration of OH- ions in the solution and the hydroxides would form more readily.
  16. Mathemagical

    Chemistry: Post your doubts here!

    It is possible. However, you can only form 2 different types since it's symmetrical. Option B involves 4 different alkenes due to cis-trans isomerism.
  17. Mathemagical

    Chemistry: Post your doubts here!

    Magnesium burns in steam to produce white magnesium oxide and hydrogen gas. http://tinyurl.com/nlg5ujc
  18. Mathemagical

    Physics: Post your doubts here!

    You're thinking of a stationary wave. This is a progressive wave, so there are no nodes where displacement is zero.
  19. Mathemagical

    Chemistry: Post your doubts here!

    If all monomers combine, one molecule of the polymer is formed, which is 1/6.02*10^23 moles. The theoretical range is between 1 and 1/6.02*10^23, but it cannot be 1.
  20. Mathemagical

    Chemistry: Post your doubts here!

    Mr(P) = 31 Mr(P2O5) = 2(31) + 5(16) = 142 In 100 g of fertiliser, there is 30.0% P2O5 That means mass of fertiliser is = (100/30) * Mr(P2O5) = (100/30) * 142 = 473.3 g % of phosphorus in fertiliser is = (2*31 / 473.3) * 100 = 13.1 %
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