Question

A colourless lead salt, when heated, produces a yellow residue and brown fumes.
1).Name the lead salt
2).Name the brown fumes
3).Write a chemical equation of the reaction involved.

Answer 1

Hint: We need to realize that the inquiry discusses a vapid lead salt. Consider the salts framed by lead, which on warming advances earthy colored exhaust. Recall the inorganic subjective salt investigation and consider the anions, which on warming advance earthy colored exhaust. At that point compose the chemical reaction.

Complete answer:
A salt, which produces brown vapor on warming, can either contain nitrates or bromide as anions. Nitrates and bromides on solid warming will frame nitrogen dioxide and bromine gas separately which are viewed as earthy colored hued exhaust. Here the inquiry says a yellow buildup is shaped. This shows that lead oxide is framed, so the drab salt of lead, which goes through deterioration, is lead nitrate.
Decomposition reaction is the process in which a compound under the presence of strong heat forms two or more simpler compounds. Lead nitrate on strong heating undergoes decomposition to form lead oxide, which is yellow in colour and nitrogen dioxide and oxygen gas are evolved. Nitrogen dioxide gas is brown in colour.
We have to know that the decomposition reaction is the cycle where a compound under the presence of solid warmth structures at least two less difficult mixtures. Lead nitrate on solid warming goes through deterioration to shape lead oxide, which is yellow in shading and nitrogen dioxide and oxygen gas are developed. Nitrogen dioxide gas is brown.
Hence,
1).Name of the lead salt is lead nitrate.
2).Name of the brown fumes is nitrogen dioxide.
3).The chemical reaction is given below,
Along these lines, the chemical reaction, this is included when a vapid lead salt is warmed as,
$2Pb{\left( {N{O_3}} \right)_2} \to 2PbO + 4N{O_2} + {O_2}$

Note:
We have to remember that recollecting lead nitrate is dry, lead oxide is yellow in shading and nitrogen dioxide gas is earthy colored in shading. Lead nitrate on decomposition structures lead oxide with the development of nitrogen dioxide gas and oxygen gas. Nitrates on warming develop nitrogen gas, which is earthy colored in shading.