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Answer the following.
Though ( ) belongs to 4d transition series and ( ) belongs to 5d transition series, yet the two…
Though $\text{Zr}$ ($Z = 40$) belongs to 4d transition series and $\text{Hf}$ ($Z = 72$) belongs to 5d transition series, yet the two cannot be separated easily.
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From ISC 2025 Improvement Chemistry Paper 1, question 20(i)(b).