Nitric Acid: Preparation, Structure, Properties and Uses

In the detection of the nitrate ion, a brown complex in the form of a brown ring is formed at the junction of the two liquids. How many unpaired electrons does this brown complex contain?

The brown ring test for nitrates depends upon

Aqua regia contains one part by volume of hydrochloric acid and three parts by volume of nitric acid.

Explain the role of nitric acid in purification of gold.

Nitric acid is used in the preparation of nitrates.

When ${\mathrm{PbO}}_2$ reacts with concentrated ${\mathrm{HNO}}_3$, the gas evolved is

The following chain of reactions give nitric acid as product by Ostwald's process:

$2\mathrm{NO}\left(\mathrm{g}\right)+ {\mathrm{O}}_2\left(\mathrm{g}\right)\stackrel{}{\rightleftharpoons } \_\_\_\_\_\left(\mathrm{g}\right)$
$3{\mathrm{NO}}_2\left(\mathrm{g}\right)+ {\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\stackrel{}{\to }\_\_\_\_\_ \left(\mathrm{aq}\right) + \mathrm{NO}\left(\mathrm{g}\right)$
The total no. of Nitrogen atoms for all the products on the right side are:

The oxidation state of nitrogen in ${\mathrm{HNO}}_3$ is:

Complete the following chemical reaction.

${\mathrm{S}}_8 + \mathrm{Conc}.{\mathrm{HNO}}_3 \stackrel{ }{\to }$
 

Complete the following chemical reaction.

${\mathrm{I}}_2 + \mathrm{conc}. {\mathrm{HNO}}_3 \stackrel{ }{\to }$

Select the correct statement from the following:

When copper is heated with conc. ${\mathrm{HNO}}_3$ it produces
 

Phosphorus reacts with nitric acid to form _____ acid.(phosphoric/phosphorous)

In the brown ring test, brown colour of the ring is due to

A brown ring is formed in the ring test for ${\mathrm{NO}}_3^{-}$ ion. It is due to the formation of

${\mathrm{FeSO}}_4$ forms brown ring with
 

What is the action of concentrated nitric acid on

Zinc

What is the action of concentrated nitric acid on

Copper

What happens when ${\mathrm{As}}_4, \mathrm{Sb},$ and${\mathrm{P}}_4$ is treated separately with hot and concentrated nitric acid?

Illustrate how copper metal can give different products on reaction with ${\mathrm{HNO}}_3$.