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Given reasons : Zn is not regarded as ...

Given reasons :
Zn is not regarded as a transition element.
(ii) `Cr^(2+)` is a strong reducing agent.

Text Solution

Verified by Experts

(i) Zn belongs too d block but not considered as transition elements because it contains completely filled 3d orbital and fo not show properties like other transition elements.
(ii) `Cr^(2+)` has the configuration `3d^(4).` It can blse electron to from `Cr^(3+)` which has stable `3d^(3)` configuration. Hence, it is strong reducing agent.
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Knowledge Check

  • Which of the following is not regarded as a transition element ?

    A
    Co
    B
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    D
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  • Alkali metals are strong reducing agents because

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    C
    Theie ionic radii large
    D
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    Consider the standard electrode potential values (M2+/M) of the elements of the first transition series. {:(Ti,,V,,Cr,,Mn,,Fe,,CO,,Ni,,Cu,,Zn),(-1.63,,-1.18,,-0.90,,-1.18,,-0.44,,-0.28,,-0.25,,+0.34,,-0.76):} Explain : (i) E^(@) value for copper is positive. (ii) E^(@) value of Mn is more negative as expected from the trend. (iii) Cr^(2+) is a stronger reducing agent than Fe^(2+) .

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