CHEMISTRY P12: INCREDIBLE!!!

[lamaj]

hey beacon of light wat was the answer to q33 in which of the equations redox rxn was taking place.
and in q 36 why was s02 being used was it A or B
in 25 how many radicals were being formed
and why pvc being used in the incinerator and i wrote it gives harmful products
in the qs in which we had 2 use pv=nrt which gas ws correct i wrote s02
in q 30 in the polymer how do we draw the shortest chain of 1,1-dichloroetene
what was the answer to q 40 i wrote A bcoz in each of them the product was a gas which cud easily easily condense using liebig condensor on the diff of b.p pllllllllllllllllllllllllllllllllllzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz replyyyyyyyyyyyyyyyyyyyy so that i cud spent my holidays free of tension

 

[ashhadazam]

Well yes it was good enuff !!!!! Well for 40 i wrote 2 and 3 option C...!! i dont know if that is correct.. because for option 1 there was h2so4 present in the reactant... which would decompose ethanol as well as react with NaBr so we wont get our product :O !!!

 

[hamizahmed]

yar paper went fine but anything can happen in chem MCQ's. U tend to expect 40 marks but u lose marks in those MCq's in whch u r fully confident of ur answers. Is liye 50.50 for me

 

[hamizahmed]

and yar ashhad, plzzzzzzzzzzzzzzzzzzz dont discuss the paper. I want to spend my vacations peacefully.

 

[hamizahmed]

And finally, freedom at last from those bloody britishers!!

 

[Meeee]

3 different radicals.
So2 is reducing thats why its used so answer ws D
pvc's ans was ozone layer option
yes So2 gives was th ryt option
shortest chain was B. C-Cl chain
last ques was B

in MY opinion =p

 

[hamizahmed]

bhai jan ans to pvc was harmful combustion products

 

[beacon_of_light]

3 different radicals.
So2 is reducing thats why its used so answer ws D
pvc's ans was ozone layer option
yes So2 gives was th ryt option
shortest chain was B. C-Cl chain
last ques was B

in MY opinion =p

yeah,
I too wrote 3 radicals...

for SO2, I wrote A...(not sure about that)

for PVC it was harmful products*(sure about that)!

for 40 i wrote B since since option 3 was incorrect as gaseous reactants were involved...and option 2 was correct as ethanal would be distilled as formed...

 

[Meeee]

theyre harmful cuz they react with ozone n break it down

 

[beacon_of_light]

for redox i wrote D ...

and SO2 had 3dm^3 volume...

it was -CH2CCL2-....somthing like that for polymerisation...

 

[beacon_of_light]

theyre harmful cuz they react with ozone n break it down

harmful combustion products are the poisionous gases releases...ur tlking bout free radical substitution....

 

[Meeee]

wasnt ans to redox ques C?
n +4,-4 for change in Nitrogen's ox state?

 

[beacon_of_light]

no only in option 1 were the oxidation states changing.....while B and C were incorrect...(you could be right aswell)

n yeah the change in oxidation state was +4 n -4....

 

[Meeee]

lol really? my bad =p
umm n 39 was D right?

 

[beacon_of_light]

which question was 39?

 

[moon]

3 different radicals.
So2 is reducing thats why its used so answer ws D
pvc's ans was ozone layer option
yes So2 gives was th ryt option
shortest chain was B. C-Cl chain
last ques was B

in MY opinion =p

why there is 3 different radicals and not 2?

 

[fzum12_13]

well guys can u plz discuss the questions from 30 to 40.
I find them difficult to answer.
thnxx

 

[Meeee]

giant MOLECULAR structure thingy?

 

[Meeee]

cuz there were 4 hydrogens tht cud be taken n two of them gav th same formula it was 3

 

[MaXiiMo]

GUYSSSSS !!
I live in KSA and im doing paper 11 in 2 hours !! :O
was the test hard ???
Any tips on the test ?
Oh and I'm POSITIVE enthalpy came right?
Wish me luck people !