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What is the role of manganese dioxide i...

What is the role of manganese dioxide in the preparation of oxygen ?

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ICSE-AIR AND ATMOSPHERE-EXERCISE - II
  1. Name : The most abundant elements in the earth's crust .

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  2. Name : A chemical called oxygenated water.

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  3. Which metal is highly resistant to corrosion?

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  4. Name : A mixture of oxygen and carbon dioxide used for artifical re...

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  5. Name : Two substances from which oxygen can be obtained on a large ...

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  6. Name : An oxide and a carbonate containing oxygen .

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  7. Name : Two substances which undergo rapid oxidation .

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  8. Taking hydrogen perioxide , how would you prepare oxygen in the labor...

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  9. What is the role of manganese dioxide in the preparation of oxygen ?

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  10. Why is hydrogen peroxide preferred in the perparation of oxgyen gas ?

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  11. Why is oxygen collected by downward displacement of water ?

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  12. What happens when a glowing splinter is introuduced in a jar contain...

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  13. What happens when oxygen gas is passes through alkaline pyrogallol ...

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  14. What happens when (i) mercuric oxidie and (ii) potassium nitrate are...

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  15. Why is postassium chlorate not used for laboratory preparation of oxy...

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  16. What are oxide ? Give two examples for each of metallic and non - meta...

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  17. Name the three types of oxidation processes. In which of these, large ...

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  18. Give four uses of oxygen.

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  19. How is oxygen naturally renewed in air ?

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  20. State two differences between : Rusting and buring.

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