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99 Percentile Qs Bank for JEE MainChemistryClassification of Elements and Periodicity in Properties

Aluminium is usually found in + 3 oxidation state. In contrast, thallium exists in + 1 and + 3 oxidation states. This is due to:

Options

  1. ADiagonal relationship
  2. BLattice effect
  3. CLanthanoid contraction
  4. DInert pair effect

Correct answer

D. Inert pair effect

Step-by-step solution

Reluctance in tendency of s-electrons to participate in bonding on moving top to bottom in p-block elements is called inert pair effect. Due to inert pair effect + 1 is very unstable in aluminium.

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