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Transition and Inner Transition Elements — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryTransition and Inner Transition Elements1 Mark
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Answer

Correct option: D.
$Nb - Ta$
(d): $Nb$ belonging to second transition series and $Ta$ belonging to third transition series have almost similar chemical properties due to lanthanoid contraction. Hence they are called chemical twins.

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