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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

The halides of transition elements become more covalent with increasing oxidation state of the metal. Why?

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प्रश्न

The halides of transition elements become more covalent with increasing oxidation state of the metal. Why?

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उत्तर

As the oxidation state of the element increases, its charge increases. To Fajans rules, as the charge of the metal ion increases covalent character increases because the positively charged cation attracts the electron cloud on the anion towards itself.

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अध्याय 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ १११]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
अध्याय 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 49 | पृष्ठ १११

संबंधित प्रश्न

Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?


How would you account for the following? 

Transition metals exhibit variable oxidation states.

 


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Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows oxidation state of +4.


Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?


How would you account for the following:

Of the d4 species, Cr2+ is strongly reducing while manganese (III) is strongly oxidising.


What is meant by ‘disproportionation’? 


Which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why?


Account for the following : 
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Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?

(i) \[\ce{Co^{2+}}\]

(ii) \[\ce{Cr^{2+}}\]

(iii) \[\ce{Mn^{2+}}\]

(iv) \[\ce{Cr^{3+}}\]


When a chromite ore (A) is fused with sodium carbonate in free excess of air and the product is dissolved in water, a yellow solution of compound (B) is obtained. After treatment of this yellow solution with sulphuric acid, compound (C) can be crystallised from the solution. When compound (C) is treated with KCl, orange crystals of compound (D) crystallise out. Identify A to D and also explain the reactions.


A metallic ion 'M' reacts with chloride ion to form white precipitate which is readily soluble in aqueous ammonia. Identify 'M'?


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Which does not belong to first transition series?


Which of the following ions has the maximum magnetic moment?


Consider the following standard electrode potential values:

\[\ce{Fe^{3+}_{ (aq)} + e^- -> Fe^{2+}_{ (aq)}}\], E0 = +0.77 V

\[\ce{MnO^{-4}_{ (aq)} + 8H^+ + 5e^- -> Mn^{2+}_{ (aq)} + 4H2O_{(l)}}\], E0 = +1.51 V

What is the cell potential for the redox reaction?


Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iron (II) solution.


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