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Hydrogen

Short Answer Type

151.

Complete the following chemical reactions.
PbS + H₂O₂ (aq) $rightwards arrow$

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152.

Complete the following chemical reactions.
$MnO subscript 4 superscript minus left parenthesis aq right parenthesis space plus space straight H subscript 2 straight O subscript 2 left parenthesis aq right parenthesis space rightwards arrow$

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153.
How does hydrogen peroxide act as bleaching agent?

H₂O₂ is used as a mild bleaching agent due to the nascent oxygen which it liberates upon decomposition.

The nascent oxygen combines with a colouring matter which in turn gets oxidised.

Colouring matter + [O] → Colourless matter

It is used for the bleaching of delicate materials like ivory, feather, silk, wool etc.

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154.

Give two chemical reactions which show the acidic character of hydrogen peroxide.

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155. Hydrogen peroxide is used to restore the colour of old oil paintings containing lead oxide. Write a balanced equation for the reaction that takes place in this process.

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