Q.

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

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a

The d-block elements have variable valency.

b

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

c

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

d

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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