$N{{H}_{4}}N{{O}_{2}}\,\xrightarrow{\text{heat}}\,\underset{(g)}{\mathop{{{N}_{2}}}}\,+\underset{(l)}{\mathop{2{{H}_{2}}O}}\,$
$(I)$ $TeF_6$ $(II)$ $SF_6$ $(III)$ $NCl_3$ $(IV)$ $NF_3$
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