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

Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the

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प्रश्न

Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:

Electronic configurations

अति संक्षिप्त उत्तर
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उत्तर

In the first transition series, the 3d orbitals are progressively filled; in the second transition series, the 4d orbitals are progressively filled; and in the third transition series, the 5d orbitals are progressively filled.

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अध्याय 4: The d-block and f-block Elements - Exercises [पृष्ठ ११७]

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एनसीईआरटी Chemistry Part 1 and 2 [English] Class 12
अध्याय 4 The d-block and f-block Elements
Exercises | Q 4.35 (i) | पृष्ठ ११७
नूतन Chemistry [English] Class 12 ISC
अध्याय 4 d-and ƒ-Block Elements
'NCERT TEXT-BOOK, Exercises | Q 8.35 (i) | पृष्ठ ५०८

संबंधित प्रश्न

Why do interstitial compounds have higher melting points than corresponding pure metals?


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


What are the transition elements? Write two characteristics of the transition elements.


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(Atomic nos. : Mn = 25, Cr = 24)


The \[\ce{E^{\circ}_{(M^{2+}/M)}}\] value for copper is positive (+0.34 V). What is possible reason for this? (Hint: consider its high ΔaH° and low ΔhydH°)


What are inner transition elements?


How would you account for the following? 

Transition metals and their compounds act as catalysts.


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Reason: Osmium is a 5d-block element.


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\[\ce{MO3F}\]


If enthalpies of formation of C2H4(g), CO2(g) and H2O(l) at 25°C and 1 atm pressure are 52, – 394 and – 286 kJ/mol respectively, the change in ethalpy for combustion of C2H4 is equal to


The given graph shows the trends in melting points of transition metals:

Explain the reason why Cr has the highest melting point and manganese (Mn) has a lower melting point.


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?


Give a reason for the following:

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


The E° value for the Mn2+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due to the change of:


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