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JEE Main202126 Feb 2021Morning ShiftChemistryd and f Block ElementsActual

Which one of the following lanthanoids does not form MO 2 ? [ M is lanthanoid metal]

Options

  1. AYb
  2. BDy
  3. CNd
  4. DPr

Correct answer

A. Yb

Step-by-step solution

Yb is the only element that does not form MO 2 type oxide. Ytterbium is a soft, malleable and rather ductile element that exhibits a bright silvery luster. A rare earth, the element is easily attacked and dissolved by mineral acids, slowly reacts with water, and oxidizes in air. The oxide forms a protective layer on the surface. Compounds of ytterbium are rare.

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