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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

NTA Abhyas 2020 · Chemistry · p Block Elements (Group 13 & 14)

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

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\text{Tl} prefers its +1\text{+1} oxidation state while bonding with iodine and TlI\text{TlI}form. Although thallium (Tl)\text{(Tl)} form TlI3Tl{I}_{3}, but the O.S. of thallium is +1\text{+1} in this compound, because iodine is present as tri-iodide ion \left({I}_{3}^{-}\right) .
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