ALL CIE CHEMISTRY DOUBTS HERE !!

[EMO123]

Oxidation product is H₂SO₃
and
Reduction Product is H

[EMO123]

Besides I've got more doubts,   

November 2007 Paper 2
Q1 b, Q2 e, Q3 d, Q5 e and d

there is no question 5 e 

[EMO123]

Q5 d)

Step I

Reagent :- PI₃
Condition :- Room Temperature

Step II

Reagent :- KCN in aqueous Ethanol
Condition :- Heat Under Reflux

Step III

Reagent :- HCl
Condition :- Heat Applied

[NidZ- Hero]

hey how is SO2 a gud reducing agent

[SkyPilotage]

hey how is SO2 a gud reducing agent

I dont get what you mean by how but SO2 reduces KMnO4 and potassium dichromate too..... while it gets oxidised.

[kulsoom]

hey guys!
i needed some help in NMR spectrometry...as in how do u deduce the molecular formula of a compound from the given chemical shifts? i dont understand it at all...
please hellppp!!
 
Thank uuu!!

[Arthur Bon Zavi]

I dont get what you mean by how but SO2 reduces KMnO4 and potassium dichromate too..... while it gets oxidised.

Reducing agent gets oxidised. Oxidising agent gets reduced.

[Arthur Bon Zavi]

hey guys!
i needed some help in NMR spectrometry...as in how do u deduce the molecular formula of a compound from the given chemical shifts? i dont understand it at all...
please hellppp!!
 
Thank uuu!!

Do you owe CIE book of Brian Ratcliff, Helen Eccles, et al ? Page number 394.

[red_911]

hey fellas 
just one question ... if we compare silver chloride n sodium chloride, sodium chloride in almost ionic while silver chloride has covalent character  ... explain it terms of ion polarisation the difference between both ? 

[Arthur Bon Zavi]

hey fellas 
just one question ... if we compare silver chloride n sodium chloride, sodium chloride in almost ionic while silver chloride has covalent character  ... explain it terms of ion polarisation the difference between both ? 

NaCl :

has ionic bonding;
giant ionic structure;
both elements face greater difference in electonegativies, so will bond more strongly thus structure is rigid.

AgCl :

holds polar covalent bonding;
less difference in electronegativities (recall the trend of electrinegativity across and down the periodic table), so will bond less strongly and hence sometimes covalently.

http://en.wikipedia.org/wiki/Ionic_polarization#Ionic_polarization

[red_911]

NaCl :

has ionic bonding;
giant ionic structure;
both elements face greater difference in electonegativies, so will bond more strongly thus structure is rigid.

AgCl :

holds polar covalent bonding;
less difference in electronegativities (recall the trend of electrinegativity across and down the periodic table), so will bond less strongly and hence sometimes covalently.

http://en.wikipedia.org/wiki/Ionic_polarization#Ionic_polarization

yea u are right fidato .. n Thanks for replying .. but your answer was with reference to electronegativity difference, i want the answer by considering ion polarisation 

[SkyPilotage]

yea u are right fidato .. n Thanks for replying .. but your answer was with reference to electronegativity difference, i want the answer by considering ion polarisation 

Well, this is because The silver ion is smaller than the sodium ion and has a higher charge density so is able to attract the electrons from the chloride ion closer to it ( we say the anion has been polarised) hence showing more covalent character than sodium chloride. This is also the same for the bromides or iodides but not the same in the flourides because flourine has a smaller radius so it is much harder to move electrons away from it due to the nuclear attraction to the electrons...

[red_911]

Well, this is because The silver ion is smaller than the sodium ion and has a higher charge density so is able to attract the electrons from the chloride ion closer to it ( we say the anion has been polarised) hence showing more covalent character than sodium chloride. This is also the same for the bromides or iodides but not the same in the flourides because flourine has a smaller radius so it is much harder to move electrons away from it due to the nuclear attraction to the electrons...

but i checked on many websites, sodium has a smaller ionic radius than silver :S

[SkyPilotage]

but i checked on many websites, sodium has a smaller ionic radius than silver :S

I mean inside the compound, silver has a smaller ionic radii than the sodium ion in NaCl....This is only shown in chlorides and bromides..
By the way I think bond polarisation isnt required in As? As only required you to know abt Aluminum?

[Arthur Bon Zavi]

Question 1 please.

http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w06_qp_1.pdf