Q7 / 180 · KCET 2025 · Chemistry

In which of the following pairs, both the elements do not have $(\mathrm{n}-1) \mathrm{d}^{10} \mathrm{~ns} \mathrm{~s}^2$ configuration?

  • A
    $\mathrm{Cu}, \mathrm{Zn}$
  • B
    $\mathrm{Zn}, \mathrm{Cd}$
  • C
    $\mathrm{Cd}, \mathrm{Hg}$
  • Correct answer
    D
    $\mathrm{Ag}, \mathrm{Cu}$

Solution

$\begin{aligned} & \mathrm{Cu}:[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^1 \\ & \mathrm{Zn}:[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^2 \\ & \mathrm{Cd}:[\mathrm{Kr}] 4 \mathrm{~d}^{10} 5 \mathrm{~s}^2 \\ & \mathrm{Hg}:[\mathrm{Xe}] 4 \mathrm{f}^{14} 5 \mathrm{~d}^{10} 6 \mathrm{~s}^2 \\ & \mathrm{Ag}:[\mathrm{Kr}] 4 \mathrm{~d}^{10} 5 \mathrm{~s}^1\end{aligned}$

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

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