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Explain the following observations : (...

Explain the following observations :
(i) Fluorine does not exhibit any positive oxidation state.
(ii) The majority of known noble gas compounds are those of Xenon.
(iii) Phosphorus is much more reactive than nitrogen.

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Fluorine being the most electronegative element, does not exhibit any oxidation state.
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Why fluorine does not exhibit any positive oxidation state?

The majority of noble gas compounds are those of xenon. Explain.

Account for the following : (i) Helium is used in diving apparatus. (ii) Fluorine does not exhibit positive oxidation state.

(a) Draw the structures of the following molecules : (i) N_(2)O_(5) (ii) HCIO_(4) (b) Explain the following observations : (i) H_(2)S is more acidic than H_(2)O . (ii)Fluorine does not exhibit any positive oxidation state . (iii) Helium forms no real chemical compound.

(a) Complete the following chemical reaction equations : (i) P_(4)+SO_(2)Cl_(2) rightarrow (ii) XeF_(4)+ H_(2)O rightarrow (b) Explain the following observations giving appropriate reasons : (i) The stability of + 5 oxidation state decreases down the group in group 15 of the periodic table. (ii) Solid phosphorus pentachloride behaves as an ionic compound. (iii) Halogens are strong oxidizing agents.

Name the following: (a) A transition metal which does not exhibit variation in oxidation state in its compounds. (b) A compound where the transition metal is the +7 oxidation state. (c) A member of the lanthanoid series which is well known to exhibit +4 oxidation state. (d) Ore used in the preparation of Potassium dichromate.

(a) Draw the structures of the following : (i) XeF_(4) (ii) H_(2)S_(2)O_(7) (iii) SO_(3)^(2-) (b) Explain the following observations : (i) Phosphorous has a greater tendency for catenation than nitrogen. (ii) The negative value of electron gain enthalpy is less for fluorine than that for chlorine. (iii) Hydrogen fluoride has a much higher boiling point than hydrogen chloride.

Explain the following observations giving an appropriate reason for each. (i) The enthalpies of atomization of transmition elements are quite high. (ii) There occurs much more frequent matal-matal bonding in compounds of heavy transition metals (i.e, 3^(rd) series). (iii) Mn^(2+) is much more resistant then Fe^(2+) toawards oxidation.

Explain the following observations: (i) Phosphorus has a greater tendency for catenation than nitrogen (ii) The negative value of electron gain enthalpy is less for fluorine than for chlorine. (iii) Hydrogen fluoride has a much higher boiling point than hydrogen chloride

(a) Draw the molecular structures of the following compounds : (i) N_(2)O_(5) " " (ii) XeOF_(4) (b) Explain the following observations : (i) Sulphur has a greater tendency for catenation than oxygen. (ii) ICI is more reactive than I_(2) . (iii) Despite lower value of its electron gain enthalpy with negative sign, fluorine (F_(2)) is a stronger oxidizing agent than Cl_(2) .

ICSE-P-BLOCK ELEMENTS-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Which is least basic ? SbH(3)PH3,NH3,AsH3

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  2. Draw the structure of XeF(2)

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  3. Among the noble gases only xenon is well known to form chemical compou...

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  4. Assign reason for the following: In solid state, PCI5 , behaves as an ...

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  5. Are all the five bonds in PCl(5) molecule equivalent? Justify your ans...

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  6. Complete the following reactions : (i) P4 + SOCl2 rarr

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  7. Complete the following reactions : (ii) CH3COOH + PCl5 rarr

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  8. What happens when (write balanced chemical equations): Ammonia is ...

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  9. In which one of the two structures, NO(2)^(+) and NO(2)^(-) the bond a...

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  10. Why is the bond angle in PH(3) molecule lesser than that in NH(3) mole...

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  11. Answer the following : (i) Which neutral molecule would be isoelectr...

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  12. Why is Bi(V) a stronger oxidant than Sb(V) ?

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  13. Why is red phosporus less reactive than white phosphorus?

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  14. In the ring test for identification of nitrate ion, what is the formul...

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  15. Write the balanced equation for complete hydrolysis of XeF6.

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  16. In what way can it be proved that PH(3) is basic in nature?

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  17. Draw the structure of O(3) molecule.

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  18. Explain the following observations : (i) Fluorine does not exhibit a...

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  19. Nitrogen is relatively inert as compared to phosphorus. Why ?

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  20. Comment on the nature of two S–O bonds formed in SO(2) molecule. Are t...

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