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ALL CIE CHEMISTRY DOUBTS HERE !!

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SkyPilotage:

--- Quote from: EMO123 on June 01, 2011, 12:35:13 pm ---but which paper

--- End quote ---
what do you think? :P Paper 1 dude :)

angel_ak:
ammonium nitrate NH4NO3, can decompose explosively when heated.

NH4NO3 ----------------> N2O + 2H2O

what are the changes in the oxidation num of the two N atoms in NH4NO3 when this reaction proceeds?

1. -2, -4
2. +2, +6
3. +4, -6
4. +4, -4

SkyPilotage:

--- Quote from: angel_ak on June 01, 2011, 01:46:42 pm ---ammonium nitrate NH4NO3, can decompose explosively when heated.

NH4NO3 ----------------> N2O + 2H2O

what are the changes in the oxidation num of the two N atoms in NH4NO3 when this reaction proceeds?

1. -2, -4
2. +2, +6
3. +4, -6
4. +4, -4

--- End quote ---
Do it stepwise...
-Oxidation number of N in NH4+ is -3 because 4H have oxidation number of +4 ANd the overall charge is 1+...
-Oxidation Number of N in NO3- is +5 because 3O have oxidation number of -6 And the overall charge is 1-....
-Oxidation number of N in N20 is +1 because O has an oxidation number of -2 And the overall charge is 0...
So from -3 to +1 is +4 and from +5 to +1 is -4..Therefore the answer is D... :)

aloha32:
Hi could anyone plz heth Nov 08 P1 Q1, 2 and 3?
Often the first onez always seem to be wierd calculations onez as compared to the rest of the paper
Thank you! :)

angel_ak:
THANKEW!!  ;D

0.200 mol of a hydrocarbon undergo complete combustion to give 35.2g of carbon dioxide and 14.4g of water as the only products. what is the molecular formula of the hydrocarbon?
1. C2H4
2. C2H6
3. C4H4
4. C4H8

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