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For the first row transition metals, the...

For the first row transition metals, the `E^(@)` values are
`{:(,E^(@),V,Cr,Mn,Fe,Co,Ni,Cu),(,(M^(2+)//M),-1.18,0.90,-1.18,-0.44,-0.28,-0.25,+0.34):}`
What is the reason for the non regularity in the above values?

A

non regular variation of ionization enthalpies

B

different number of electrons present in `M^(2+)` ions

C

non-regular variation of ionic radii

D

the variation in densities of transition metals.

Text Solution

Verified by Experts

The correct Answer is:
A
A it is the correct reason. For details consult section 8:4
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For the first row trasition metals the E^(ɵ) value are: {:(underset(-1.18)(V),,underset(-0.91)(Cr),,underset(-1.18)(Mn),,underset(-0.44)(Fe),,underset(-0.28)(Co),,underset(-0.25)(Ni),underset(+0.34)(Cu)):} Explain the irregularity in the abpve values.

Use the data to answer the following and also justify giving rason: {:(," "Cr," "Mn," "Fe," "Co),(E_(M^(2+)//M)^0,-0.91,-1.18,-0.44,-0.28),(E_(M^(2+)//M^(2+))^0,-0.41,+1.57,+0.77,+1.97):} ( a) Which is a stronger redusing agent in aqueous medium Cr^(2) or Fe^(2+) and why ? ( b) Which is the most stable ion in +2 oxidartion and why ?

{:(E_(M^(2+)//M)^(@),Cr,Mn, Fe, Co, Ni, Cu),(,-0.91,-1.18,-0.44,-0.28,-0.25,+0.34):} From the given data of E^(@) values, answer the following questions : (i) Why is E_((Cu^(2+)//Cu))^(@) value exceptionally positive ? (ii) Why is E_((M^(2+)//M))^(@) vlue highly negative as compared to other elements ? (iii) Which is a stronger reducing agent , Cr^(2+) or Fe^(2+) ? Give reason.

The E^(0)(M^(2+)//M) value for copper is positive (+0.34V) . What is possibly the reason for this?

{:("Element",Cr,Mn,Fe),(E^(0)(M^(2+)//M),-0.90V,-1.18V,-0.4V),(E^(0)(M^(3+)//M^(2+)),(-0.41V,+1.57V,+0.8V):} Use this data to comment upon (i) The stability of Fe^(3+) and Mn^(2+) in acid solution. (ii) The ease with which iron can be oxidised as compared to the similar process for either Cr or Mn Metals.

DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Select the correct answer
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  8. Among the transition metals of 3d series, that one that has the highes...

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  9. For the first row transition metals, the E^(@) values are {:(,E^(@),...

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  15. In which of the following actinoid elements, 6d sub-shells is vacant?

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