Question

Pure Nitrogen can be obtained by passing ammonia vapours over heated copper (II) oxide $\left(CuO\right)$ – True or False?

• A. True
• B. False

Answer 1

The correct option is A True

Ammonia reacts with copper (II) oxide to form pure nitrogen.
$2N{H}_3\left(g\right)+3CuO\left(s\right)\to N_2\left(g\right)+3Cu\left(s\right)+3H_{2}O\left(g\right)$
Pure Nitrogen can also be preparing the thermal decomposition of azides, which can be prepared as:
$N_{2}O+2NaN{H}_2\to$
$Na{N}_3+NaOH+N{H}_3$
When heated, sodium azide gives
$2Na{N}_3\to 2Na+3N_2$
Further, in the laboratory, $N_2$ can be obtained by the thermal decomposition of Ammonium dichromate. Can you try that reaction? A hint is that Chromium (III) oxide is one of the products.