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Which of the following statement(s) is/are correct?

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The d-block elements have variable valency.

The inner transition elements belong to the f' block of the periodic table and are shown separately at the bottom of the periodic table.

All the lanthanides and actinides belong to III B or the 3rd group in the Periodic table.

Among the following elements: K, Mn, Cd, Cs, Fe, Cu, Pb, Os, Y. The number of transition element is 4.

answer is B, C, D.

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Detailed Solution

Statement (1) is wrong. The number of transition elements is five (Mn, Fe, Cu, Os, Y).

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