Question

$P{{b}_{3}}{{O}_{4}}$ reacts with $HN{{O}_{3}}$ forming nitrate and oxide which are:
(A)- $Pb{{(N{{O}_{3}})}_{4}}$ from $Pb{{O}_{2}}$, and PbO remains unreacted.
(B)- $Pb{{(N{{O}_{3}})}_{2}}$ from PbO, and $Pb{{O}_{2}}$ remains unreacted.
(C)- $Pb{{(N{{O}_{3}})}_{2}}$ and $Pb{{(N{{O}_{3}})}_{4}}$, and PbO remains unreacted.
(D)- $P{{b}_{3}}{{O}_{4}}$ remains insoluble in $HN{{O}_{3}}$.

Answer 1

Hint: Reaction between lead tetroxide and nitric acid is an oxidation-reduction (redox) reaction. Here lead tetraoxide is both an oxidizing and reducing agent.

Complete Step by step answer:
-Lead tetroxide, also known as red lead or minium is the inorganic compound of bright red or orange solid is a mixed-valence compound.
-Nitric acid, also known as aqua fortis or spirit of nitre is a highly corrosive mineral acid which is colourless and primarily used for nitration. Most commercially, $68%$ concentration in water of nitric acid is available. When this concentration is increased, it is referred to as fuming nitric acid.
-The oxidation and reduction reaction of lead tetroxide is given as-
\[\begin{align}
 & 2P{{b}^{8/3}}+4/3\text{ }{{e}^{-}}\to 2P{{b}^{II}}(reduction) \\
& P{{b}^{8/3}}-4/3\text{ }{{\text{e}}^{-}}\to P{{b}^{IV}}(oxidation) \\
\end{align}\]
-The final reaction between lead tetroxide and nitric acid is given as-
$P{{b}_{3}}{{O}_{4}}+4HN{{O}_{3}}\to 2Pb{{(N{{O}_{3}})}_{2}}+Pb{{O}_{2}}+2{{H}_{2}}O$
-Lead(II) nitrate is an inorganic compound which is a colourless crystal or white powder which is soluble in water.
-Lead(IV) oxide is a dark-brown solid which exists in two crystalline forms and is insoluble in water. It has several important applications in electrochemistry. Lead dioxide is a good oxidizing agent and is an amphoteric compound with prevalent acidic conditions. It is also used in the field of pyrotechnics, dyes and the curing of sulfide polymers.

Note: Lead(II) nitrate is very toxic and must be handled with care avoiding the direct or indirect inhalation, ingestion and skin contact. Lead nitrate has been used as a heat stabilizer in nylon and polyester and as a coating for photo thermographic paper. Lead compounds are classified as a carcinogenic to humans as it is linked to causing renal cancer, brain cancer and lung cancer.