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

Reactivity of transition elements decreases almost regularly from Sc to Cu. Explain. - Chemistry

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प्रश्न

Reactivity of transition elements decreases almost regularly from Sc to Cu. Explain.

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उत्तर

Reactivity of an element is dependent on the value of ionization enthalpy. In moving from Sc, the first element to Cu, the ionization enthalpy increases regularly. Therefore, the reactivity decreases as we move from Sc to Cu.

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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 51 | पृष्ठ १११

संबंधित प्रश्‍न

Calculate magnetic moment of  `Fe_((aq))^(2+) ion (Z=26).`


Explain why Cu+ ion is not stable in aqueous solutions?


Predict which of the following will be coloured in the aqueous solution?

Ti3+, V3+, Cu+, Sc3+, Mn2+, Fe3+ and Co2+. Give reasons for each.


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.


What is meant by ‘disproportionation’? 


Use Hund’s rule to derive the electronic configuration of Ce3+ ion and calculate its magnetic moment on the basis of ‘spin-only’ formula.


NF3 is possible, but NF5 is not. Why?


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


Complete and balance the following chemical equations

`Fe^(2+) + MnO_4^(-) + H^+ ->`


When \[\ce{KMnO4}\] solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because ______.


Which of the following ions show higher spin only magnetic moment value?

(i) \[\ce{Ti^3+}\]

(ii) \[\ce{Mn2+}\]

(iii) \[\ce{Fe2+}\]

(iv) \[\ce{Co3+}\]


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


Assertion: Separation of \[\ce{Zr}\] and \[\ce{Hf}\] is difficult.

Reason: Because \[\ce{Zr}\] and \[\ce{Hf}\] lie in the same group of the periodic table.


Assertion (A): Cu cannot liberate hydrogen from acids.

Reason (R): Because it has positive electrode potential.


Answer the following question:

Which element of the first transition series has lowest enthalpy of atomisation?


Why are all copper halides known except that copper iodide?


Give reasons for the following statement:

Zn, Cd, and Hg are soft metals.


Assertion (A): Transition metals have high enthalpy of atomisation.

Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.


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?


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


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