Question

Which of the following will yield $N_2$ when heated?

• A. $Na{N}_3$
• B. $N{H}_{4}N{O}_2$
• C. $N{H}_{4}N{O}_3$
• D. $(N{H}_4{)}_{2}C{r}_2{O}_7$

Answer 1

Answer: (A), (B), (D)

The correct options are
A

$Na{N}_3$

B

$N{H}_{4}N{O}_2$

D

$(N{H}_4{)}_{2}C{r}_2{O}_7$

On controlled decomposition,
$2Na{N}_3⟶2Na+3N_2\uparrow$

This reaction produces toxic Cr(III):

$(N{H}_4{)}_{2}C{r}_2{O}_7\stackrel{\Delta }{⟶}{N}_2\uparrow +C{r}_2{O}_3+4H_{2}O\uparrow$

$N{H}_{4}N{O}_2\stackrel{\Delta }{⟶}{N}_2\uparrow +2H_{2}O$

This doesn't yield dinitrogen, but does give Nitrogen (I) oxide:

$N{H}_{4}N{O}_3\stackrel{\Delta }{⟶}{N}_{2}O\uparrow +2H_{2}O$