Q1 / 160 · AP EAMCET 2020 (21 Sep Shift 2) · Chemistry

Which element of the \(3 d\)-series has highest third ionisation enthalpy?

  • A
    \(\mathrm{Mn}\)
  • Correct answer
    B
    \(\mathrm{Zn}\)
  • C
    \(\mathrm{Fe}\)
  • D
    \(\mathrm{Cu}\)

Solution

The electronic configuration of zinc metal is \(\mathrm{Zn} \Rightarrow[\mathrm{Ar}] 3 d^{10}, 4 s^2\) The third ionisation enthalpy of \(\mathrm{Zn}\) means removal of electron from the stable configuration of \(3 d^{10}\). The metal having the highest third ionisation enthalpy is \(\mathrm{Zn}\). Hence, the correct option is (b).

Hence, the correct answer is option: 'B'.

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