Question

A white salt on heating decomposes to give brown fumes and a residue is left behind (1) name is the salt , (2) write the balanced chemical equation involved

Answer 1

Answer:

1. Lead Nitrate, 2  2Pb(No 3)2-->2Pbo+4NO2+O2

Explanation:

The chemical name of white salt is Lead nitrate Pb(NO3)2.

The salt on heating produces brown fumes. This implies that the salt contains nitrate ion. This salt can be any nitrate but if the residue left after heating is yellow in colour implies that the salt is lead nitrate.

The equation involved can be shown as:

2Pb(NO3)2 → 2PbO + 4NO2 + O2

Lead nitrate Lead oxide Nitrogen dioxide

Colourless Yellow Brown fumes

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Answer 2

Answer:

(1) Lead nitrate: $2Pb(NO_{3} )_{2}$

(2) $2Pb(NO_{3} )_{2}$ → $2PbO + 4NO_{2} + O_{2}$

Explanation:

The salt of lead nitrate is of white color. When given favourable conditions, it decomposes and gives brown fumes, which signifies the presence of nitrate ion i.e., $NO_{2}$. It also gives yellow precipitate, which is due to the presence of lead oxide, i.e., PbO.

Hence, the correct answer is Lead nitrate and the equation is as follows:

$2Pb(NO_{3} )_{2}$ → $2PbO + 4NO_{2} + O_{2}$

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