Chemistry Paper 2

[xxfarhaxx]

C6H8O7, definitely.

!!!!!

 

[aaditya menon]

i gues is AlCl3..
mny sy its P..bt i wrte Na
jst flpd organic!!!

I'm not sure if it's AlCl3 or Al2Cl6. I wrote P too, don't know why. Never heard of PCl5/PCl3 burning with a coloured flame, weird question man.
And did Aluminum chloride dissolve or react? I think it reacts coz it forms a complex and an H+. meh

 

[rogue94]

For the empirical formula part:
C was 37.5 %, H was 4.17% and O was 58.3% so,
C:H:O = 37.5/12 : 4.17/1 : 58.3/16
= 3.125 : 4.17 : 3.644 then divide all values by lowest value 3.125 so,
= 1 : 1.334 : 1.166 then multiply sll values by 6 to obtain simplest whole no. ratio
= 6 : 8 : 7
Hence, the answer was definitely C6H8O7!

 

[aaditya menon]

"Aluminium chloride is hygroscopic, having a very high affinity for water. It fumes in moist air and hisses when mixed with liquid water as the Cl- ions are displaced with H2O molecules in the lattice to form the hexahydrate AlCl3·6H2O (also white to yellowish in color). The anhydrous phase cannot be regained on heating as HCl is lost leaving aluminium hydroxide or alumina (aluminium oxide):"

That should count as a reaction right? Dissolving? Pfft

 

[dayeed]

yaar skeletal formula kaisay banana tha...? cis trans ka kaisay pata chalta hai skeletal formula mein -_-

 

[Hifsa]

AlCl3 or Al2Cl6?
Does Aluminum chloride react with water or dissolve in it?
The period 3 chloride which burns with a colored flame is?
The organic question, do both the -COOH groups get converted to an ester group when they react with an alcohol?

AlCl3, Na burns with a yellow flame, and AlCl3 reacts pH 1-4
and yes both the -COOH reacted with the alcohol

 

[Hifsa]

!!!!!

 

[fathimaash]

AlCl3, Na burns with a yellow flame, and AlCl3 reacts pH 1-4
and yes both the -COOH reacted with the alcohol

no its one -COOH reacts with da alcohol it cant be both.. im 100% sure

 

[Hifsa]

no its one -COOH reacts with da alcohol it cant be both.. im 100% sure

Lol. no you can even google it, the ester of malic acid has 2 ester groups

 

[fathimaash]

ya dere is but in dis particular question we r gvn with just one alcohol just CH3OH

 

[xxfarhaxx]

I'm not sure if it's AlCl3 or Al2Cl6. I wrote P too, don't know why. Never heard of PCl5/PCl3 burning with a coloured flame, weird question man.
And did Aluminum chloride dissolve or react? I think it reacts coz it forms a complex and an H+. meh

Al forms a yellow sold bt dsnt burn with colourd flam!!!
idk ..its al up to da CIE xaminer!!!

 

[Thampi4]

C6H8O7, definitely.

is that for chem p22?

 

[Arslanjaved]

guys if we have wrong answer for empirical formula
how many marks will we get for working?

 

[Arslanjaved]

why does argon not react with chlorine?
Ans: The Ea for reaction is very high
will we get full marks for this?
the same question has come in may june 2010 p2 variant 22

 

[Rubaisha Siddiqui]

which variant are u talking about ?

22

 

[Rubaisha Siddiqui]

was good .. threshold around 50 for sure

dats too high... 44-46 is xpcted...!!!

 

[Rubaisha Siddiqui]

enthalpy change was -129 i guess.

yeah it ws -129!!

 

[aaditya menon]

is that for chem p22?

yea

 

[aaditya menon]

why does argon not react with chlorine?
Ans: The Ea for reaction is very high
will we get full marks for this?
the same question has come in may june 2010 p2 variant 22

yup, correct

 

[aaditya menon]

Are you guyz sure it was -129? Coz the enthalpy change of the reaction worked out to +129 for me and my friends. :-/
Variant 22