Name: Balancing of Redox Reactions: Oxidation Number Method(Part I)
Uploaded: 2019-07-19
Duration: 6 min 13 s
Description: Redox reactions involve a change in the oxidation number of elements. Let us find out how to balance a redox reaction by the oxidation number method occurrin...

Question

A colourless lead salt when heated produces a yellow residue and brown fumes.
(i) Name the lead salt (ii) Name the brown fumes (iii) Write the chemical equation for the reaction involved.

Accepted Answer

i) When a colourless lead nitrate salt is heated that produces a yellow residue and brown fumes. It is a white powdered compound with the chemical formula $Pb ({NO}_{3})_{2}$ .

ii) The lead nitrate is a white crystalline solid. Heating the substance lead nitrate crystals in a test tube gives reddish-brown fumes with pungent smell which is nitrogen dioxide.

iii) The chemical reaction involved in the decomposition of lead nitrate is as follows;

$\underset{Colourless}{\underset{Lead nitrate}{2 Pb {({NO}_{3})}_{2} (s)}} \overset{Heat}{\to} \underset{(yellow residue)}{\underset{Lead oxide}{2 PbO (s)}} + \underset{(Reddish - brown fumes)}{\underset{Nitrogen dioxide}{4 {NO}_{2} (g)}} + \underset{Oxygen}{O_{2} (g)}$

A colourless lead salt when heated produces a yellow residue and brown fumes.
(i) Name the lead salt (ii) Name the brown fumes (iii) Write the chemical equation for the reaction involved.

Important Questions on Chemical Reactions and Equations

Learn and Prepare for any exam you want !

A colourless lead salt when heated produces a yellow residue and brown fumes. (i) Name the lead salt (ii) Name the brown fumes (iii) Write the chemical equation for the reaction involved.

Important Questions on Chemical Reactions and Equations

Learn and Prepare for any exam you want !

A colourless lead salt when heated produces a yellow residue and brown fumes.
(i) Name the lead salt (ii) Name the brown fumes (iii) Write the chemical equation for the reaction involved.