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Illustrate how copper metal can give dif...

Illustrate how copper metal can give different product on reaction with `HNO_3`.

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Concentrated nitric acid is a strong oxidizing agent. It is used for oxidizing most metals. The products of oxidation depend on the concentration of the acid, temperature, and also on the material undergoing oxidation.
`3Cu + 8HNO_(3("dilute")) to 3Cu (NO_(3))_(2) + 2NO + 4H_(2)O`
`Cu + 4HNO_(3 ("conc")) to Cu (NO_(3))_(2) + 2NO_(2) + 2H_(2)O`
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NCERT-THE P-BLOCK ELEMENTS-EXERCISE
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  2. How is ammonia manufactured industrially?

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  4. Give the resonating structures of NO(2) and N(2)O(5).

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  6. Why does R3P=O exist but R3N=O does not (R= alkyl group)?

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  7. Explain why NH(3) is basic while BiH(3) is only feebly basic ?

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  8. Nitrogen exists as diatomic molecule and phosphorus as P(4). Why ?

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  9. Write main differences between the properties of white phosphorus and ...

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  10. Why does nitrogen show catenation properties less than phosphorus.

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  11. Give the disproportionation reaction of H3PO3.

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  12. Can PCl5 act as an oxidising as well as a reducing agent? Justify.

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  13. Justify the placement of O, S, Se, Te and Po in the same group of the ...

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  14. Why is dioxygen a gas but sulphur a solid?

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  15. Knowing the electron gain enthalpy values for O rarr O^(Ө) and O rarr ...

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  16. Which aerosols deplete ozone?

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  17. Describe the manufacture of H(2)SO(4) by contact process?

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  18. How is SO2 an air pollutant?

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  19. Why are halogens strong oxidising agents ?

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  20. Explain why fluorine forms only one oxoacid, HOF.

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