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ALL CIE CHEMISTRY DOUBTS HERE !!

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Deadly_king:
Nov 09 P4 Q8

c)(ii) If two chlorine atoms are present, the three possibilities are : Cl35-Cl35, Cl35-Cl37 and Cl37-Cl37

Cl35 and Cl37 exist in the ratio 3 : 1

Probability of obtaining Cl35-Cl35 = 3/4 x 3/4 = 9/16 ---> M peak
Probability of obtaining Cl35-Cl37 = 2(3/4 x 1/4) = 6/16 ---> M+2 peak
Probability of obtaining Cl37-Cl37 = 1/4 x 1/4 = 1/16 ----> M+4 peak

Therefore the ratio will be 9 : 6 : 1

NOTE : The probability for M+2 peak is multiplied by two since it can exist both as Cl35-Cl37 and Cl37-Cl35

d)(ii) PCBs.
This is because when you compare the graphs upstream and downstream, you will note that PCBs is already in very high concentration unlike the others which are present in minimal amount.

Therefore after passing the mill, the concentration of the other three chemicals increase in concentration showing that the mill releases these chemicals.

(iv) Four chlorine atoms will result in 5 possible peakss.
1. Cl35-Cl35-Cl35-Cl35
2. Cl37-Cl37-Cl37-Cl37
3. Cl35-Cl37-Cl37-Cl37
4. Cl35-Cl37-Cl35-Cl37
5. Cl37-Cl37-Cl37-Cl35

NOTE : The arrangement of the atoms in each case may differ but they will form the same peak.

Hope it helps :)

Deadly_king:

--- Quote from: Garfield on October 09, 2010, 07:08:37 am ---Considering it's an MCQ , you wouldn't want to do it the long way ;)

My pleasure :)

--- End quote ---
Absolutely right madam  ;)

ashish:

--- Quote from: Deadly_king on October 08, 2010, 06:38:34 pm ---Good job pal........though it was a bit long  ;)

+ rep

--- End quote ---

^_^ thank you !

$!$RatJumper$!$:
For chemistry practical.. what is the best way to study for it other than actually doing it in school? We're on study leave so dont have access to lab equipment. How is the best way to do it at home?

elemis:

--- Quote from: $!$RatJumper$!$ on October 09, 2010, 11:29:17 am ---For chemistry practical.. what is the best way to study for it other than actually doing it in school? We're on study leave so dont have access to lab equipment. How is the best way to do it at home?

--- End quote ---

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