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How is nitrogen prepared in the laborato...

How is nitrogen prepared in the laboratory? Write the chemical equations of the reactions involved.

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An aqueous solution of ammonium chloride is treated with sodium nitrite.
`NH_(4)Cl_((aq)) + NaNO _(2(aq)) to N_(2(g)) + 2(H_(2)O_((l)) + NaCl_((aq))`
NO and `HNO_(3)` are produced in small amounts. These are impurities that can be removed on passing nitrogen gas through aqueous sulphuric acid, containing potassium dichromate.
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NCERT-THE P-BLOCK ELEMENTS-EXERCISE
  1. Discuss the trends in chemical reactivity of group 15 elements.

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  2. Why does NH3 form hydrogen bond but PH3 does not?

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  3. How is nitrogen prepared in the laboratory? Write the chemical equatio...

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  4. How is ammonia manufactured industrially?

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  5. Illustrate how copper metal can give different product on reaction wit...

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

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

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

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

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

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

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

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  13. Give the disproportionation reaction of H3PO3.

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

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

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

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

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  18. Which aerosols deplete ozone?

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

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  20. How is SO2 an air pollutant?

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