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NEET2023ChemistryClassification of Elements and Periodicity in PropertiesActual

Taking stability as the factor, which one of the following represent the correct relationship?

Options

  1. ATlI > TlI 3
  2. BTlCl 3 > TlCl
  3. CInI 3 > InI
  4. DAlCl > AlCl 3

Correct answer

A. TlI > TlI 3

Step-by-step solution

Due to the inert pair effect, +1 state stability increases down the group and +3 state stability decreases down the group. Hence, Tl + is more stable than Tl 3 + . Hence, TlI is more stable than TlI 3 .

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