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Statues coated with white lead on long e...

Statues coated with white lead on long exposure to atmosphere turn black and the original colour can be restored on treatment with 'H_2 O_2'. Why?

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V PUBLICATION-HYDROGEN-QUESTION BANK
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  8. Hydrogen forms three type of bonds in its compounds. Describe each typ...

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  9. Name one example of a reaction in which dihydrogen acts as (i) an oxid...

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  10. a) Compare atomic hydrogen with nascent hydrogen.

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  11. Anhydrous 'BaO2' is not used for preparing 'H2 O2 .' Why?

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  12. Hydrogen forms compounds with elements having atomic number '9,11,12' ...

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  14. Why hard water is not used in industrial boilers for producing steam?

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