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Answer the following question: Which element of the first transition series has lowest enthalpy of atomisation? - Chemistry

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प्रश्न

Answer the following question:

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

दीर्घउत्तर
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उत्तर

Zinc is the element of the first transition series that has the lowest enthalpy of atomisation. The electronic configuration of zinc is: \[\ce{3d^10 4s^2}\]. This is because it has filled 3d-subshell and filled 4s-subshell so no unpaid electron is available for metallic bonding.

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अध्याय 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ ११५]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 12
अध्याय 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 68.(iii).(a) | पृष्ठ ११५

संबंधित प्रश्न

Which of the following cations are coloured in aqueous solutions and why ?

Sc3+, V3+, Ti4+, Mn2+ (At. Nos. Sc = 21, V = 23, Ti = 22, Mn = 25)


How would you account for the following? 

Transition metals exhibit variable oxidation states.

 


Account for the following: 

Cr2+ is a strong reducing agent.


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


Which is a stronger reducing agent, Cr2+ or Fe2+ and why?


What can be inferred from the magnetic moment value of the following complex species?

Example Magnetic Moment (BM)
K2[MnCl4] 5.9

Which one of the following ions is coloured?


Write balanced chemical equations for the conversion of `CrO_4^(2-)` to `Cr_2O_7^(2-)` in acidic medium and `Cr_2O_7^(2-)` to `CrO_4^(2-)`
 in basic medium.


Complete and balance the following chemical equations

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


Transition metals with highest melting point is ____________.


Why is \[\ce{HCl}\] not used to make the medium acidic in oxidation reactions of \[\ce{KMnO4}\] in acidic medium?


Which of the following will not act as oxidising agents?

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

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

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

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


Although fluorine is more electronegative than oxygen, but the ability of oxygen to stabilise higher oxidation states exceeds that of fluorine. Why?


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


Catalytic hydrogenation of benzene gives


Sodium this sulphate is used in photography because of its:-


Give reasons for the following statement:

Transition metals and most of their compounds show paramagnetic behaviour.


A pair of coloured ions is ______.


Explain the use of different transition metals as catalysts.


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:

Ionisation enthalpies


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