Chemistry · 2022
JEE Main · 28 July 2022, Shift 2 · Q38
Which of the following pair is not isoelectronic species? (At. no. Sm, 62; Er, 68; Yb, 70; Lu, 71; Eu, 63; Tb, 65; Tm, 69)
Which of the following pair is not isoelectronic species?
(At. no. Sm, $\displaystyle 62$; Er, $\displaystyle 68$; Yb, $\displaystyle 70$; Lu, $\displaystyle 71$; Eu, $\displaystyle 63$; Tb, $\displaystyle 65$; Tm, $\displaystyle 69$)
Official answer
(1)
$\displaystyle \mathrm{Sm}^{2+} \text { and } \mathrm{Er}^{3+}$
(4)
$\displaystyle \mathrm{Tb}^{2+} \text { and } \mathrm{Tm}^{4+}$
NTA’s answer key accepts either.
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JEE Main 2022 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.