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The D-And-f-Block Elements

Question
CBSEENCH12011177
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Four successive members of the first series of the transition metals are listed below. For which one of them, the standard potential value left parenthesis straight E subscript straight M to the power of 2 plus end exponent divided by straight M end subscript superscript straight o right parenthesis has a positive sign?

  • Co (Z=27)

  • Ni (Z=28)

  • Cu (Z=29)

  • Fe (Z=26)

Solution

C.

Cu (Z=29)

In electrochemical series metals with positive standard potential are placed below hydrogen. Out of the given transition metals, only Cu is placed below hydrogen in the electrochemical series. Therefore, it must have a positive sign for standard potential.

Some More Questions From The d-And-f-Block Elements Chapter

Explain why Cu+ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

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Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

Why are transition elements known as d-block elements?

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