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(a) Give reasons for the following: (i...

(a) Give reasons for the following:
(i) Sulphurin vapour state shows paramagnetic behaviour.
(ii) N-N bond is weaker than P-P bond.
(iii) Ozone is thermodynamically less stable than oxygen.
(b) Write the name of gas released when Cu is added to:
(i) dilute `HNO_(3)` and,
(ii) conc. `HNO_(3)`

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Assign a reason for each of the following statements : (i) Ammonia is a stronger base than phosphine. (ii) Sulphur in vapour state exhibits a paramagnetic behaviour.

Give reasons for the following : (i) Where R is an alkyl group, R_(3)P=O" exists but "R_(3)N=O does not. (ii) PbCl_(4)" is more covalent than "PbCl_(2). (iii) At room temperature, N_(2) is much less reactive.

Give reasons for the following: (i) Oxygen is a gas but sulpher is a solid. (ii) O_(3) acts as a powerful oxidising agent. (iii) BiH_(3) is the strongest reducing agent amongst all the hydrides of Groups 15 elements.

(a) Given reasons for the following : (i) Bond enthalpy of F_2 is lower than that of Cl_2 . (ii) PH_3 has lower boiling point than NH_3 . (b) Draw the structures of the following molecules : (i) BrF_3 (ii) (HPO_3)_3 (iii) XeF_4

Account for the following : (i) NH_(3) is a stronger base than PH_(3) (ii) Sulphur has a greater tendency for catenation than oxygen. (iii) Bond dissociation energy of F_(2) is less than that of Cl_(2) .

Give reasons for the following : (i) Though nitrogen exhibits + 5 oxidation state, it does not fonn pentahalide. (ii) Electron gain enthalpy with negative sign of fluorine is less than that of chlorine. (iii) The two oxygen-oxygen bond lengths in ozone molecule are identical.

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ICSE-P-BLOCK ELEMENTS-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(SHORT ANSWER QUESTIONS)
  1. (a) Draw the molecular structures of the following compounds : (i) N...

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  2. How would you account for the following : (i) The electron gain enth...

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  3. (a) Give reasons for the following: (i) Sulphurin vapour state shows...

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  4. (a) Account for the following observations : (i) SF(4) is easily hyd...

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  5. Explain the following situations : (ii) Sulfur exhibits greater tend...

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  6. Why oxygen differs from the rest of the members of its family?

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  7. Give the structures of the following compounds : (i) Peroxomonosulfu...

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  8. Give reasons for the following : Fluorine shows an oxidation state o...

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  9. Give reasons for the following : Fluorine has lower electron gain en...

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  10. Give reasons for the following : HF has abnormally high melting and ...

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  11. Why the melting and boiling points of halogens increase in going from ...

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  12. How is chlorine produced industrially?

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  13. Why are halogens coloured?

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  14. Why F2 is the strongest oxidising agent, although it has lower electro...

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  15. Why are halogens strong oxidising agents?

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  16. Why does fluorine not form polyfluorides?

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  17. What are hallucinogens? Give their two examples. Mention their clinica...

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  18. Why does fluorine exhibit abnormal behaviour ?

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  19. Why special methods are employed for the preparation of HBr and HI ?

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  20. Explain the trends in property in halogen family as given under: (i)...

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