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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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Reactions of Cu metal with `HNO_3`:
(i). `Cu+dil.HNO_3overset(Delta)toNO` is evolved (colourless gas)
`3Cu+8HNO_3overset(Delta)to3Cu(NO_3)_2+4H_2O+2NO`
(ii). `Cu+conc.HNO_3overset(Delta)toNO_2` is evolved
`Cu+4HNO_3overset(Delta)Cu(NO_3)_2+2H_2O+2NO_2`
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  5. The HNH angle value is higher than HPH, HAsH and HSbH angles. Why?

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  6. Why does R3P=0 exist but R3N=0 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 P4. Why?

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

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

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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 per...

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

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  17. How is SO2 an air pollutant?

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

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  20. Although chlorine and oxygen have nearly same electronegativity yet on...

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