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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.

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Long Answer Type

159.

How is strength of hydrogen peroxide expressed? Calculate the strength of 20 volume hydrogen peroxide in grams per litre.

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160.
Calculate the strength of 10 volume solution of hydrogen peroxide.

Hydrogen peroxide decomposes on heating as,

We know,
22400 mL of O₂ at STP are produced from H₂O₂ = 68 g

10 ml of O₂ at STP would be produced from H₂O₂ =
But 10 ml of oxygen at STP are produced from 1 ml of 10 volume of H₂O₂ solution.
Thus 1 ml of 10 volume at H₂O₂ solution contains = 0.03036 g H₂O_2.
1000 ml of 10 volume of H₂O₂ solution
would contain = 0 .03036 x 1000 = 30.36g H₂O₂
Strength of 10 volume H₂O₂ = 30.36g L^-1