MHT CET · Chemistry · d and f Block Elements

Identify false statement about transition elements.

A These exhibit properties between those of s and p block elements.
B All these elements are grouped as 3d to 6 d series.
C 5 d series is comprised of all elements from \(\mathrm{La}(Z=57)\) to \(\mathrm{Hg}(Z=80)\).
D Elements of 6 d series belongs to \(7^{\text {th }}\) period of periodic table.

Verified Solution

Answer & Solution

Correct Answer

(C) 5 d series is comprised of all elements from \(\mathrm{La}(Z=57)\) to \(\mathrm{Hg}(Z=80)\).

Step-by-step Solution

Detailed explanation

The \(\mathbf{5 d}\) series of transition elements includes elements from Z = 72 (Hf, Hafnium) to Z = 105 (Db, Dubnium), not from Z = 57 (La, Lanthanum) to Z = 80 (Hg, Mercury). The elements from \(\mathrm{Z}=57\) to \(\mathrm{Z}=71\) are the lanthanides (rare earth elements), and Hg ( \(\mathrm{Z}=\) 80) is a part of the group 12 elements, not the 5d transition series.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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