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Iron becomes passive in conc. "HNO"(3) -...

Iron becomes passive in conc. `"HNO"_(3)` - Why ?

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Iron becomes passive in conc. `"HNO"_(3)` due to formation of a passive film of oxide on the surface of iron.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-P-BLOCK ELEMENTS -GROUP 15 ELEMENTS (VERY SHORT ANSWER QUESTIONS)
  1. Which oxide of nitrogen has oxidation number of N same as that in nitr...

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  2. Write the chemical reactions that occur in the manufacture of nitric a...

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  3. Iron becomes passive in conc. "HNO"(3) - Why ?

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  4. Give the uses of a) nitric aicd and b) ammonia.

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  5. What are the oxidation states of phosphorus in the following ? H(3)P...

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  6. What are the oxidation states of phosphorus in the following ? "PCl"...

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  7. What are the oxidation states of phosphorus in the following ? "Ca"(...

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  8. What are the oxidation states of phosphorus in the following ? "Na"(...

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  9. What are the oxidation states of phosphorus in the following ? "POF"...

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  10. H(3)"PO"(3) is diprotic while H(3)"PO"(2) is monoprotic - Why ?

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  11. Give the disproportionation reaction of H(3)PO(3).

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  12. H(3)PO(2) is a good reducing agent - Explain with an example.

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  13. Draw the structures of Hypo phosphoric acid

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  14. Draw the structures of Cyclic meta phosphoric acid.

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  15. Give an example of neutral oxide of nitrogen.

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  16. Give the paramagnetic oxides of nitrogen.

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  17. Why is white phosphorus is more reactive than red phosphorus ?

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  18. Why does PCl(3) fume in moisture ?

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  19. Explain the following reaction of alkali with red phosphrous.

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  20. Explain the following reaction between PCl(3)" and "H(2)O.

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