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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.

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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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Long Answer Type

156. What is the structure of hydrogen peroxide? Draw a schematic diagram indicating the shape of the molecule clearly.

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157.

Compare the structure of H₂O and H₂O₂

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Short Answer Type

158.
Enlist the important uses of hydrogen peroxide.

Uses of hydrogen peroxide:

(i) As a dilute solution of hydrogen peroxide is used as antiseptic in medicine and surgery.

(ii) It is used to bleach silk, wool, ivory, hair etc.

(iii) It is used to restore the colour of old and spoiled lead paintings.

(iv) 90% solution of hydrogen peroxide is used as a propellant or fuel in torpedoes, submarines and rockets.

(v) It is used as an antichlor in bleaching.

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