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Answer 1 · 2017-01-20T12:05:55

$2stackrel(+2)Hg(stackrel(+5)Nstackrel(-2)O_3)_2stackrel(Delta)->2stackrel(0)Hg+2stackrel(+4)NO_2+stackrel(0)O_2$

The changes in oxidation number of elements in the given reaction are as follows

$stackrel(+2)Hg->stackrel(0)Hg=>"2 unit reduction"$

$stackrel(+5)N->stackrel(+4)N=>"1 unit reduction"$

$stackrel(-2)O->stackrel(0)O=>"2 unit oxidation"$

It is obvious from above change in ON that the reaction is an intramolecular redox reaction brought about by heat.

Answer 2 · 2017-01-22T02:28:37

Noting that one reactant is producing several simpler products I would just call it a (thermal) decomposition.