Physics NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 7 PCB MCQ (Single Correct)

The incorrect statement among the following is

A
Lanthanoids are good conductors of heat and electricity
B
Actinoid contraction is greater for element than lanthanoid contraction.
C
Most of the trivalent lanthanoid ions are colourless in the solid state.
D
Actinoids are highly reactive metals, especially when finely divided

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The correct answer is:
C

Trivalent lanthanoid ions are colored in the solid state due to presence of unpaired electrons which are responsible for transitions. Except and ion, rest of the ions show colour.

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