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Explain the following : Why the wooden...

Explain the following :
Why the wooden shelves on which concentrated sulphuric acid bottles are kept stained black ?

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ICSE-SULPHURIC ACID-ADDITIONAL QUESTIONS FOR PRACTICE
  1. Explain the following : Why the wooden shelves on which concentrated...

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  2. Explain the following : Why concentrated sulphuric acid is always ad...

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  3. How sulphuric acid is prepared industrially by Contact process ? Suppo...

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  4. Why sulphur trioxide formed in this process is not absorbed directly i...

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  5. Why vanadium pentoxide is considered as a better catalyst than platini...

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  6. Why heating of catalyst is discontinued the moment the oxidation of su...

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  7. How does sulphuric acid react with the following ? State experimental ...

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  8. What will you observe when concentrated sulphuric acid is poured on (i...

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  9. Give a chemical test to distinguish between dilute sulphuric acid an...

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  10. Name the following: An ore other than zinc blende which on roasting g...

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  11. Give one similarity and two differences between bleaching action of su...

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  12. Write the equation for the laboratory preparation of sulphur dioxide f...

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  13. How is sulphur dioxide gas collected ?

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  14. What does the method of collecting tell you about the density of sulph...

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  15. What do you see when sulphur dioxide is bubbled through an acidified p...

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  16. Write an equation in each case to show the action of sulphur dioxide a...

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  17. When chlorine is involved in bleaching, what is the type of chemical r...

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  18. What is the reason for not using chlorine to bleach wool?

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  19. Name the products formed when hot and concentrated sulphuric acid reac...

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  20. Give reasons for the following: Sulphuric acid form two types of sa...

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