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Vin:

--- Quote from: rhea on June 05, 2010, 08:32:22 pm ---what about nitrite?

nd sulphite and carbntes of ONLY NA and K do not decompose?

--- End quote ---

Nitrates of Na and K decompose, but in a different way.. products are different

2 Zn(NO3)2  ----> 2ZnO  + 4 NO2 + O2

2 KNO3  ----> 2 KNO2   +  O2

Hg(NO3)2  ---->  2Hg  +  2NO2  +  O2

2AgNO3  ----> 2Ag  +  2 NO2  +  O2


Yup only Na and K

okay, not sure about nitrites, because they are formed by the decomposition of (K, Na)nitrates itself..

CatAly$t:

--- Quote from: Shooting Star on June 05, 2010, 08:22:12 pm ---
this answers ur question catalyst

--- End quote ---

thx girl... :D

also mohit man...

Allyza1n:
hey...

Could someone plzz answer question 5 b from chemistry 2009 may june variant one....

Vin:

--- Quote from: Allyza1n on June 05, 2010, 09:15:45 pm ---hey...

Could someone plzz answer question 5 b from chemistry 2009 may june variant one....

--- End quote ---

here you go

https://studentforums.biz/index.php/topic,1411.msg249826.html#msg249826

NidZ- Hero:
HEATING HYDROXIDES
Sodium hydroxide and potassium hydroxide are NOT CHANGED by heating
them.
Calcium hydroxide and magnesium hydroxide behave in the same way.
HYDROXIDE + HEAT = OXIDE + WATER
Ca(OH)2(aq) = CaO(s) + H2O(l)
Mg(OH)2(aq) = MgO(s) + H2O(l)
Iron (III) hydroxide is also decomposed by heating to form iron (III) oxide and
water.
2Fe(OH)3(s) = Fe2O3(s) + 3H2O(l)
HEATING NITRATES
Group 1 nitrate + heat = group 1 nitrite + oxygen gas
2NaNO3(s) = 2NaNO2 + O2(g)
2KNO3(s) = 2NKNO2 + O2(g)
All other nitrates behave in the same way when heated
NITRATE + HEAT = OXIDE + NITRITE + OXYGEN GAS
2Ca(NO3)2 = 2CaO(S) + 4NO2(g) + O2(g)
2Cu(NO3)2 = 2CuO(S) + 4NO2(g) + O2(g)
2Zn(NO3)2 = 2ZnO(S) + 4NO2(g) + O2(g)

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