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Illustrate how copper metal can give dif...

Illustrate how copper metal can give different products on reaction with `HNO_(3)`.

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Copper, on heating with dil. `HNO_(3)` , produces copper nitrate and nitric oxide (NO).
`3Cu+8HNO_(3)("dil.")overset("Heat")to3Cu(NO_(3))_(2)+4H_(2)O+2NO`
On heating with conc. `HNO_(3)` , copper produces copper nitrate with the evolution of nitrogen dioxide `(NO_(2))` gas.
`Cu+4HNO_(3)"(conc.)"overset("Heat")toCu(NO_(3))_(2)+2H_(2)O+2NO_(2)`
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CHHAYA PUBLICATION-P-BLOCK ELEMENTS-NCERT EXERCISE QUESTIONS
  1. How is nitrogen prepared in the laboratory? Write the chemical equatio...

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  2. How is ammonia manufactured industrially?

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  3. Illustrate how copper metal can give different products on reaction wi...

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

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  5. The HNH angle value is higher than HPH, HAsH and HSbH angles. Why? [Hi...

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  6. Why does R(3)P =O exist but R(3)N =O does not (R = alkyl group)?

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  7. Explain: 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 H(3)PO(3).

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  12. Can PCl(5) 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 to O^(-) and OtoO^(2-)...

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  16. Which aerosols deplete ozone?

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

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  18. How is SO(2) 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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