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For successive members of the first seri...

For successive members of the first series of the transition metals are listed below. For which one of the them the standard potential `(E_(M^(2+)|M)^(@))` value has a positive sign -

A

`Ni(Z=28)`

B

`Cu(Z=29)`

C

`Fe(Z=26)`

D

`Co(Z=27)`

Text Solution

Verified by Experts

The correct Answer is:
B
Among the given elements, only `Cu` stands below hydrogen in the electrochemical series. Hence only `Cu` possess a positive standard electrode potential.
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Elements A, B ,C and atomic number (Z-2), Z and (Z+1) respectively. Of these, B is an inert gas. (a) which one of these has the highest electronegativity? (b) which one of these has the highest value of ionisation potential (c) what is the compound formed by the combination of A and C?

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Knowledge Check

  • Four successive members of the first series of the transition metals are listed below. For which one of them the standard reduction potential (E_(M^(2+)|M)^(0)) value has a positive sign -

    A
    Ni (Z = 28)
    B
    Cu (Z = 29)
    C
    Fe (Z = 26)
    D
    Co (Z = 27)

  • Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest E_(M^(3+)|M^(2+))^(0) value -

    A
    Cr (Z = 24)
    B
    Mn (Z = 25)
    C
    Fe (Z = 26)
    D
    Co (Z = 27)

  • Which one of the alkali metals forms only the normal oxide M_2O on heating in air-

    A
    Li
    B
    Na
    C
    Rb
    D
    K

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