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Account for the following : (a) (i) Cop...

Account for the following : (a) (i) Copper(I) compounds are white whereas Copper(II) compounds are coloured. (ii) Chromates change their colour when kept in an acidic solution. (iii) Zn,Cd, Hg are considered as d-block elements but not as transition elements. (b) Calculate the spin only moment of `Co^(2+)`(Z=27) by writing the electronic configuration of Co and `Co^(2+)`

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In copper(I) ion, all orbitals are completely filled `(3d^(10)4s^(0))` and, therefore, it is diamagnetic and forms white compounds. Copper (II) ion has electronic configuration `3d^(9)` (has one unpaired electrons) and, therefore, it is paramagnetic and forms coloured compounds.
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(a) Account for the following : (i) Copper(I) compounds are white whereas Copper(II) compounds are coloured. (ii) Chromates change their colour when kept in an acidic solution. (iii) Zn,Cd, Hg are considered as d-block elements but not as transition elements. (b) Calculate the spin only moment of Co^(2+) (Z=27) by writing the electronic configuration of Co and Co^(2+)

How would you account for the following : (i) Among lanthanoids , Ln(III) compounds are predominant , However, occasionally in solutions or in solid compounds , +2 and +4 ions are also obtained . (ii) The E_(M2+//M)^(@) for copper is positive (0.34V ) . Copper is the only metal in the first series of transition elements showing this behaviour . (iii) The metallic radii of the third (5d) series of transition metals are nearly the same as those of the corresponding members of the second series .

(a) Give reasons for the following : (i) Compounds of transition elements are generally coloured. (ii) MnO is basic while Mn_(2)O_(7) acidic. (b) Calculate the magnetic moment of a divalent ion squeous medium of its atomic number is 26.

Explain the following observations: (i) Transition elements are known to form many interstitial compounds.. (ii) With the same d^4 configuration Cr^(2+) ion is reducing while Mn^(3+) ion is oxidising. (iii) The enthalpies of atomization of the transition elements are quite high.

(a) Account for the following : (i) Cu^(+) is unstable in an aqueous solution. (ii) Transition metals form complex compounds. (b) Complete the following equation: Cr_(2)O_(7)^(2-)+8H^(+)+3NO_(2)^(-)rarr

Assign reasons for each of the following : (i) Transiti9n metals generally form coloured compounds. (ii) Manganese exhibits the highest oxidation state of+ 7 among the 3d series of transition elements.

Give reasons for the following: (i) Transition elements and their compounds act as catalysts (ii) E^(@) value for (Mn^(2+) | Mn) is negative whereas for (Cu^(2+) | Cu) is positive. (iii) Actinoids show irregularities in their electronic configuration.

Account for the following (i) Co(II) is stable in aqueous solution but in the presence of strong ligand and air , it can get oxidized to Co(III) . (ii) [Ni(CN)_(4)]^(2-) is square planar and diamagnetic whereas [NiCl_(4)]^(2-) is tetrahedral and paramagnetic .

How and you account for the following : (i) Cabalt (II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised. (ii) The transition elements exhibit high enthalpy of atomization. (iii) of the d^4 species, Cr^(2+) is strongly reducing while Mn (III) is strongly oxidsing .

(a) Account for the following : (i) Transition metals form large number of complex compounds (ii) The lowest oxide of transition metal is basic whereas the highest oxide is amphoteric or acidic (iii) E^(@) value for the Mn^(3+)//Mn^(2+) couple is highly positive (+1.57V) as compare to Cr^(3+)//Cr^(2+) (b) Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.

CENGAGE CHEMISTRY ENGLISH-APPENDIX INORGANIC VOLUME 2-Short Answer Type
  1. How does the ionic/covalent character of the compounds of a transition...

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  2. Name the elements which are not really transition elements but are dis...

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  3. Account for the following : (a) (i) Copper(I) compounds are white whe...

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  4. What happens when chromates are kept in acidic solution and dichromate...

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  5. Which is the most common oxidation state of lanthanoids?

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  6. In the transition element series starting from lanthanun (""(57)La), t...

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  7. Why does vanadium pentoxide acts as a catalyst?

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  8. The size of the trivalent cations in the lanthanoid series decreases s...

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  9. Give the general electronic configuration of actinoids

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  10. Write any two uses of pyrophoric alloys.

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  11. What is the maximum oxidation state in actinoids?

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  12. Name one ore each of manganese and chromium.

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  13. In the transition series, with an increase in atomic number, the atomi...

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  14. What is the effect of increasing pH on K2Cr2O7 solution?

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  15. What is the basic difference between the electronic configurations of ...

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  16. Why do transition elements show similarities along the horizontal peri...

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  17. Out of Al, Zn, Mg and Fe which is the densest element?

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  18. Write the electronic configuration of the element with atomic number 1...

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  19. Explain why transition elements have many irregularities in their elec...

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  20. Explain the following : The paramagnetic character in 3d-transition ...

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