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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? - Chemistry

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

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

संबंधित प्रश्‍न

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element has the highest m.p?


Which of the 3d series of the transition metals exhibits the largest number of oxidation states and why?


How would you account for the following:

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


How would you account for the following:

Cobalt (II) is stable in aqueous solutions, but in the presence of complexing reagents, it is easily oxidised.


Dissociation of H2S is suppressed in acidic medium.


The paramagnetic character in the 3d-transition series elements increases up to Mn and then decreases.


Explain why transition elements form alloys.


Explain why transition metals and their compounds act as a catalyst.


Why EΘ values for Mn, Ni and Zn are more negative than expected?


Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why?


Assertion: The highest oxidation state of osmium is +8.

Reason: Osmium is a 5d-block element.


Answer the following question:

Which element of the first transition series has highest third ionisation enthalpy?


On strong heating AgNO3, the gases evolved are:-


Match List - I with List - II.

List - I List - II
(A) [Fe(CN)6]3− (i) 5.92 BM
(B) [Fe(H2O)6]3+ (ii) 0 BM
(C) [Fe(CN)6]4− (iii) 4.90 BM
(D) [Fe(H2O)6]2+ (iv) 1.73 BM

Choose the correct answer from the options given below.


Why is the `"E"_(("V"^(3+)//"V"^(2+)))^"o"` value for vanadium comparatively low?


Which one among the following metals of the 3d series has the lowest melting point?


Which of the following ions has the electronic configuration 3d6?
(Atomic number: Mn = 25, Co = 27, Ni = 28)


Account for the following:

Eu2+ with electronic configuration [Xe]4f76s2 is a strong reducing agent.


What is the oxidation state of chromium in chromate ion and dichromate ion?


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