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NTA Abhyas JEE Main2020Chemistryp Block Elements (Group 13 & 14)Practice

Which of the group element does not form M(III) iodide?

Options

  1. AAl
  2. BGa
  3. CIn
  4. DTl

Correct answer

D. Tl

Step-by-step solution

Due to inert pair effect, Tl prefers its +1 oxidation state while bonding with iodine and TlI form. Although thallium (Tl) form T l I 3 , but the O.S. of thallium is +1 in this compound, because iodine is present as tri-iodide ion I 3 - .

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