Question

a colourless lead salt when heated produces a yellow residue and brown fumes. 1. Name the lead Salt & Brows fumes 2. give the Equation

Answer 1

Explanation:

(a) the colourless salt of lead will be - lead nitrate (Pb(NO3)2

(b) on heating Lead Nitrate forms lead oxide and brown coloured Nitrogen dioxide gas (NO2)

(c) 2Pb(NO3)2=2PbO+4NO2+O2

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Answer 2

$\underline{\underline{\huge{\mathfrak{\red{Answer : }}}}}$

1) The colourless lead salt is lead nitrate $\rm Pb(NO_3)_2$

The brown fumes are of nitrogen dioxide gas $\rm NO_2$ when lead nitrate is heated .

2) The equation can be written as :

$\rm \orange{ 2Pb(NO_3)_2 \xrightarrow{\Delta} 2PbO + 4NO_2 + O_2}$

________________________

• Lead Nitrate is a white crystalline solid .

• Its molecular weight is 331 g/mol .

• It is soluble in water .

• It is used in manufacturing of matches and some explosives .

• It is hazardous to health as its ingestion might lead to toxication in body parts like kidney , central nervous system , etc.