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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 is the most electronegative element and cannot exhibit any positive 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) .

XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-CHEMISTRY (Theory) [SET - I]
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  2. 2 g each of two solutes A and B (molar mass of A is greater than that...

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

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  4. Give the IUPA name of the following compound :

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  5. Write the structure of the molecule of compound whose IUPAC name is 1-...

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  6. What is Tollen's reagent? Write one usefulness of this reagent.

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  8. How can you describe the designation 6, 6, mean in the name nylon -6, ...

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  9. Define the terms, 'osmosis' and 'osmotic pressure'. What is the advant...

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  10. Express the relation among cell constant , resistance of the solution ...

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  11. Given that the standard electrode (E^(@)) of metals are : K^(+)//K=-...

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  12. Describe the following : (i) Tyndall effect (ii) Shape-selective c...

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  13. What is meant by coagulation of a colloidal solution? Name any method ...

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  14. Complete the following reactions (i) C(2)H(5)OC(2)H(5)+HCl to (ii...

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  15. Draw the structural formulae of the following compounds : (i) H(4)P(...

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  16. Give the chemical tests to distinguish between the following pairs of ...

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  17. Identify A and B in each of the following processes : (i) CH(3)CH(2...

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  18. Draw the structures of the monomers of the following polymers: (i) Po...

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  19. The density of copper metal is 8.95" g "cm^(-3). If the redius of copp...

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