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Old lead paintings are generally washed ...

Old lead paintings are generally washed with dilute solution of `H_(2)O_(2)` in order to regain their colour. Why?

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Black colour in the paintings is due to `PbS` which is oxidised to `PbSO_(4)`, a white compound.
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Assertion:- The colour of old lead paintings can be retored by washing with dilute solution of H_(2)O_(2) Reason:- Black lead sulphide is oxidised by H_(2)O_(2) to white lead sulphate.

K_(a) of H_(2)O_(2) is of the order of

Assertion (A) : The colour of old lead painting can be restored by washing with dilute solution of H_2O_2 . Reason (R) : Black lead sulphide is oxidised by H_2O_2 to white lead suphate.

CENGAGE CHEMISTRY-APPENDIX - INORGANIC VOLUME 1-Exercise Short
  1. Which organic reagent can be used for the manufacture of hydrogen pero...

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  2. H(2)O(2)+Cl(2)to 2HCl+O(2) In the above reaction, H(2)O(2) act as .

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  3. Old lead paintings are generally washed with dilute solution of H(2)O(...

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  4. What is the dihedral angle between two H atoms of H(2)O(2)?

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  5. What is the product of the reaction between benzene and H(2)O(2)?

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  6. Which isotope of hydrogen (a) does not contain neutron, (b) contains e...

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  7. Why is dihydrogen not preferred in weather balloons these days?

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  8. Name two compounds which retard the decomposition of H(2)O(2).

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  9. What do you mean by 15 volume H(2)O(2) solution?

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  10. Give an example of a compound in which hydrogen exists in (a) +1, (b) ...

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  11. Can marine species live in distilled water?

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  12. Give an example of (i) ionic hydride, (ii) covalent hydride.

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  13. Why oxide ion is called a hard ion?

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  14. How is D(2)O(2) prepared?

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  15. Complete the following: CaC(2)+2D(2)Oto?

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  16. 10 mL of a given solution of H(2)O(2) contains 0.91 g of H(2)O(2). Exp...

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  17. In some toothpastes hydrogen peroxide is used. What is the role of H(2...

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  18. What is Fenton's reagent?

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  19. What is perhydrol? Give its composition and use.

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  20. Explain why calcuim ion makes water hard, but sodium ion does not.

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