First slide

Hydrogen Peroxide

Question

H₂O₂ turns blackened lead paintings to white colour. In this reaction it oxidises PbS to PbSO₄. The number of moles of H₂O₂ needed to oxidise one mole of PbS is.

Easy

A

1
B

2
C

0.5
D

4

Solution

[H₂O₂→ H₂O + [O]]x4
$\large \begin{array}{*{20}{c}} {4{H_2}{O_2}\; \to \;4{H_2}O\; + \;4[O]} \\ {PbS\; + \;4[O]\; \to \;PbS{o_4}} \\ {\overline {\mathop {Pbs}\limits_{Black} \; + \;4{H_2}{O_2}\; \to \;\mathop {PbS{o_4}}\limits_{White\;PPT} \downarrow \;\;4{H_2}O} } \end{array}$

Therefore, the number of moles of H₂O₂ required is 4 for the conversion of mole of Pbs to PbSO₄

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