1. Tardigrade
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  3. Chemistry
  4. Assertion: PbI 4 of lead does not exist. Reason: Pb - I bond initially formed during the reaction does not release enough energy to unpair 6 s2 electrons.

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Q. Assertion : $PbI _4$ of lead does not exist.
Reason : $Pb - I$ bond initially formed during the reaction does not release enough energy to unpair $6 s^2$ electrons.

The p-Block Elements

Solution:

$PbI _4$ does not exist because $Pb - I$ bond initially formed during the reaction does not release enough energy to unpair $6 s^2$ electrons and excite one of them to higher orbital to have four unpaired electrons around lead atom.