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ALL CIE CHEMISTRY DOUBTS HERE !!

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HUSH1994:

--- Quote from: Ari Ben Canaan on May 27, 2011, 11:31:35 am ---Question 10

A catalyst serves to LOWER the activation energy... does that help ?

Question 40

Alkaline Hydrolysis gives you the Sodium salt and the alcohol

Question 38

To determine if Option 1 is correct, look at the double bonds and the alcohol group at the end. KMnO4 would oxidise the alcohol to what ? An aldehyde or a ketone ? If you cant tell, then look at the no. of carbons the hydroxyl group is joined to.

Next, look at the double bonds. Can you see a place where a secondary alcohol (which upon further oxidation would form a ketone) could forrm as a result of oxidation by KMnO4 ?

Option 2 should be easy to prove/disprove.

Option 3 - Hint: Can you see any carboxylic acid groups ?



--- End quote ---
+rep,man your explanations are really amazing :)

EMO123:

--- Quote from: iluvme on May 27, 2011, 11:07:01 am ---I've got more doubts, Can somebody please explain?

June 2009, Paper 1
10
11
15
18
20
29
30
38 and
40

Thank You :)

--- End quote ---
Question 11

3N2 is not really much unreactive gas but in this case they are unreactive gas
but my doubt is from the last two equations which is correct
plzz explain

i also need help in Q 15

in Question 18
i got the residue as Fe(OH)2
but i dint get the gas as NH3 i got it as SO2

and also need help in Q 20

HUSH1994:
in Q15,the AgCl is insoluble,so a reaction with a more reactive metal causes Ag's displacement(from AgCl to NaCl).
Q20 : the compound has 3 double bonds,therefore you use 2 to the power of 3 which is equal to 8.

EMO123:

--- Quote from: EMO123 on May 27, 2011, 01:48:01 pm ---Question 11

3N2 is not really much unreactive gas but in this case they are unreactive gas
but my doubt is from the last two equations which is correct
plzz explain

i also need help in Q 15

in Question 18
i got the residue as Fe(OH)2
but i dint get the gas as NH3 i got it as SO2

and also need help in Q 20

--- End quote ---
in Q no. 11
as said that only the heat is evolved and and an unreactive gas i produced
that means that it just forms an unreactive gas as it is the same o the option C is the correct answer

in Q no. 15
at some extend you are right only hush
and one more thing in it is that ions are always in aqueous forms so they are soluble so the answer for this is A

in Q no. 18
it is that as it is given that and alkaline solution is formed so it can be only NH3
and for the solid residue is Fe(OH)2 because it is given that one cation is Fe2+ and the other thing given is it is soluble in water so it will form a hydroxide so the answer for it is C.

hope it helps
and well triad Hush

EMO123:
for Q no 20
may be this helps
http://www.chemguide.co.uk/basicorg/isomerism/geometric.html#top

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