CHEMISTRY PAPER 21

[WellWIshER]

guys how was it?

 

[1992]

it was a dificult exam, extremely the part of periodicity!!!

 

[ashhadazam]

Our variant was the easiest paper ever :/

 

[Evolular]

p21 was quiteeee tricky paper

 

[imiosa92]

it was way easier than last year (i repeated it) if yu read and did enough past question there's no way you'd get less than average

 

[sweetie ♥]

hey,
i guess it waz eazy.......
wat did u ryt for the part which says why reaction1 needs heat while reaction 2 doesnt?????????

 

[wadha]

ma paper went awesome but i guess da two variants were completely different))))))
but p51 was da easies paper anyone cnfrm with da periodicity ans can u plzzzzzz tell me da ans for da oxide of most electronegative atom
and which contains 8 atoms

 

[wadha]

can sme plzzz ans i am confused plzzz

 

[1992]

the one of 8 atoms i put oxygen but its wrong.
the one of bigest radii i put K
the one of flotting in water i put Cu
the most electronegative i put FO2

 

[1992]

hey,
i guess it waz eazy.......
wat did u ryt for the part which says why reaction1 needs heat while reaction 2 doesnt?????????

no idea niether :S
i think i put that Naoh and H2So4 are very reactive so they react instantaneouly

 

[lotto]

yea sulfur contains 8 atoms!!! and i think it waz fluorine!!

 

[1992]

and the one of that floats in water?? what was it?? i put Cu dont know y lol
what is a cordinate bond?? i think it was that, the one of circling the pair of electrons. waht was the answer??

 

[student92]

the one that was abt floating in water was Na i guess
and yea sulfur contains 8 atoms
and the one that reacts wid water to give a solution that behaves as oxidising agents is Cl

 

[Vlad]

QUESTIONS OF PAPER 21 WERE MATCHING WITH PAPER 22 OR 21 WAS TOTALY DIFFERENT ? BECOZ I TOLD SOME KIDS WHAT CAME IN MY PAPER 22 :S

 

[Vlad]

the one that was abt floating in water was Na i guess
and yea sulfur contains 8 atoms
and the one that reacts wid water to give a solution that behaves as oxidising agents is Cl

YES CL BEHAVS OXY. AGENT. I WROTE IT TOO IN MY PAPER 22.

 

[farah]

the one which contains 8 atoms is sulfur, oxide of most electronegative atom is F2O , cation with biggest radius is Ca , and the one which floats is Na....
1992 I answered K and FO2 like u but i guess they're wrong ... :S not sure

 

[wadha]

for da most electronegativity oxide i wrote nitrogen dioxide (not sure at all)
floats on water i wrote calcium
for 8 atoms i wrote sulpur (s8)
and for da ionic radii i put K
can sme one plzzz tell me da right ans
plzzzzzzzzzzzzzzzzzzzzz
need help

 

[wadha]

is sme one cnfrmed with sa ans of perodicity plz let mev knw
thnks

 

[ammarfarook]

Hi!
The most electronegative oxide is F2O
Floats on water could be any top grp 1....i wrote Na
One with eight atoms is Sulphur
Largest Ionic radius was K
Acidic oxides from the same element was SO2 and SO3
Element that reacts with water to form oxidising agent was Cl
all answers are confirmed!

 

[1992]

oh got one wrong :S the one of Na
did anyone know how to circle the pair of electrons?'