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

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प्रश्न

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

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उत्तर

Negative E° values of Mn2+ and Zn2+ are because of stabilities of half-filled (3d10 : Mn2+) and fully-filled (3d10 : Zn2+) configuration respectively.Mn2+ ion has higher EΘ value because of highest negative enthalpy of hydrogen.

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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 33 | पृष्ठ १११

संबंधित प्रश्न

Why is Sc3+ colourless while Ti3+ coloured? (Atomic number Sc = 21, Ti =22)


In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?


Write the factors which are related to the colour of transition metal ions.


An analysis shows that FeO has a non-stoichiometric composition with formula Fe0.95O. Give reason.


Dissociation of H2S is suppressed in acidic medium.


Explain why transition elements form alloys.


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


Which of the following will not act as oxidising agents?

(i) \[\ce{CrO3}\]

(ii) \[\ce{MoO3}\]

(iii) \[\ce{WO3}\]

(iv) \[\ce{CrO^{2-}4}\]


Which one of the following characters tie of the transition metal is associated with higher catalytic activity?


Which of the following ions has the maximum magnetic moment?


Give reason for the following statement:

[Ti(H2O)]3+ is coloured while [Sc(H2O)6]3+ is colourless.


In the ground state of atomic Fe (Z = 26), the spin-only magnetic moment is ______ × 10-1 BM.
(Round off to the nearest integer).

[Given: `sqrt3 = 1.73, sqrt2 = 1.41`]


Which of the following transition metals shows +1 and +2 oxidation states?


Which property of transition metals enables them to behave as catalysts?


Consider the following standard electrode potential values:

\[\ce{Sn^{2+}_{ (aq)} + 2e^- -> Sn_{(s)}}\]; E0 = −0.14 V

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

What is the cell reaction and potential for the spontaneous reaction that occurs?


The trend of which property is represented by the following graph?


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


Give a reason for the following:

Zinc, cadmium and mercury are considered as d-block elements but not regarded as transition elements.


Account for the following:

Zirconium (Zr) and Hafnium (Hf) are difficult to separate.


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