HOW WAS CHEMISTRY PAPER 22 ?

[babycry]

I guess the first reaction was for an aldehyde being oxidised to a carboxylic acid. I wrote orange to green. I don't think it was a tertiary alcohol. The compound to be oxidized was (CH3)3CHO. Wouldn't the aldehyde group be oxidized to a carboxylic acid?

how can carbon form 6 bonds if its an aldehyde :S

 

[Iadmireblue]

How many color changes did u get ?

One colour change

 

[ijjukittu]

how many marks were for the 'drying agent' part???

 

[cowarrior]

2

how many marks were for the 'drying agent' part???

 

[ijjukittu]

2

Oh No!!! N Thank u !

 

[MrAnon]

how many grams of zinc ethonate need to be taken for 15 mg of zinc?
ai got something less than 1 i think it was 0.05 or something

Yes! It was 0.5g of the whole med.

 

[MrAnon]

Oh No!!! N Thank u !

it was CaO right?
B/c CaO converts to Ca(OH)2 ?

 

[MrAnon]

For equilibrium, it was (0+x)^2 / (0.02-x)^2. And then x was 0.018. What did u guys get?

(0+x)^2 / (0.02-x)^2 = 59

Do the math.

 

[ijjukittu]

it was CaO right?
B/c CaO converts to Ca(OH)2 ?

Yeah!!!! But i didn't knew how to explain this? so i wrote conc. h2so4 ,as i was short of time :/

 

[MrAnon]

Yeah!!!! But i didn't knew how to explain this? so i wrote conc. h2so4 ,as i was short of time :/

The paper was weird man. No worries bro. Try to do good in P1. :'(

 

[MrAnon]

What was the deal with the first ques where they asked about 15mg of zinc per day thing? :S

For that 0.5g of raw medicine should be taken so that the patient gets a dose 0.15mg of zinc.

 

[ijjukittu]

The paper was weird man. No worries bro. Try to do good in P1. :'(

yeah...........

 

[izzahzainab]

Oh I drew the 3d formula as that is the only way to 'show' two optical isomers. :/ most of the students found organic part tricky.

 

[arsalan116]

-Q5 doubt!

In isomerism part, i drew a cis-trans in first one.

Didn't knew what to do in second part. So i drew structural isomer.

What do you guys think?

the other shoul be optical... as they asked for sterio isomers

 

[arsalan116]

Only B, with Fehling's! A big table for only one answer :/

what was the color change

 

[arsalan116]

Do you remember the exact wording in the question?

How can we draw an optical in a C=C?

Did the question said "also" stereo isomerism?
I don't remember anything.

for C=C we have to draw cis-trans.. and optical for the one having chiral center

 

[arsalan116]

how many grams of zinc ethonate need to be taken for 15 mg of zinc?
ai got something less than 1 i think it was 0.05 or something

0.05 g ? or mg ?

 

[arsalan116]

For the conversion of 15mg to grams. it was 15x10^-3, right? Then yes it was 0.05.

what if i write 50 g ? accept hoga ?

 

[arsalan116]

r u all people repeaters???? i m a repeater though

r u a beaconite ? which branch ?

 

[Idolfanatic95]

what if i write 50 g ? accept hoga ?

Um no. cuz it was 0.05g :O