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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?

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154.
Give two chemical reactions which show the acidic character of hydrogen peroxide.

Pure hydrogen peroxide turns blue litmus red indicating its acidic nature. The acidic character of hydrogen peroxide is indicated by the following reactions:

(i) Action with hydroxides. Hydrogen peroxide reacts to give peroxides:

(ii) Action with carbonates. Hydrogen peroxide decomposes carbonates to yield carbon dioxide.

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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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