heating xxx nitrate

Question

係咪heat 所有xxx nitrate,sodium nitrate,ammonium nitrate 都會produce xxxoxide+NO2?

Answer 1

There are four types of reaction in heating metal nitrates, mainly related to the reactivity of the metal. The reactive series of common metals that can form nitrates :
K, Na, Ca, Mg, Al, Zn, Cr, Fe, Sn, Ni, Pb, Cu, Hg, Ag

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Type 1 : KNO3 and NaNO3
Each of them decomposes to give sodium/potassium nitrite and oxygen gas.
2KNO3(s) → 2KNO2(s) + O2(g)
2NaNO3(s) → 2NaNO2(s) + O2(g)

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Type 2 : Ca(NO3)2, Mg(NO3)2 … Pb(NO3)2, Cu(NO3)2
Each of them decomposes to give a metal oxide, nitrogen dioxide gas, and oxygen gas.
2Ca(NO3)2(s) → 2CaO(s) + 4NO2(g) + O2(g)
……
……
2Cu(NO3)2(s) → 2CuO(s) + 4NO2(g) + O2(g)
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Type 3 : Hg(NO3)2 and AgNO3
Each of them decomposes to give a metal, nitrogen dioxide, and oxygen gas.
Hg(NO3)2(s) → Hg(l) + 2NO2(g) + O2(g)
2AgNO3(s) → 2Ag(s) + 2NO2(g) + O2(g)

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Type 4 : NH4NO3
It decomposes to give dinitrogen monoxide gas and water vapour. The reaction is sublimation.
NH4NO3(s) → N2O(g) + 2H2O(g)

Answer 2

in the metal reactivity series,K, Na, Ca, Mg, Al Zn, Fe, Pb, Cu, Hg, Ag, Au
when xxx=
--Ca
2XNO3 --> 2XNO2 + O2
Mg--Cu
4XNO3 --> 2X2O + 2NO2 + 3O2
Ag--
2XNO3 --> 2X + 2NO2 + O2