Question

$PbO_{2}$ is obtained from

• A. the reaction of $PbO$ with $HCl$
• B. thermal decomposition of $Pb(NO_{3} )_{2}$ at $200^{\circ}C$
• C. the reaction of $Pb_{3} O_{4}$ with $HNO_{3}$
• D. the reaction of $Pb$ with air at room temperature

Answer 1

Answer: (C)

(a) $PbO+HCl \to \underset{\text{(not correct option) }}{{PbCl_{2}+H_{2}O}}$
(b) $2pb(NO_{3})_{2} \to 2PbO+\underset{\text{(not correct option)}}{{4NO_{2}+O_{2}}}$
(c) $Pb_{3}O_{4}+4HNO_{3}\to 2Pb(NO_{3})_{2}+PbO_{2}+2h_{2}O$ (correct option)
(d) Pb + air (contains $O_{2}, H_{2}O$ and $CO_{2})$ $\ce{ ->[{\text{room}}][{\text{temperature}}] }$
Protective layer of varying composition, mainly $PbCO_{3}$ is formed only on the surface,