Question

Thallium shows different oxidation states because
(a) It is transition element
(b) Of inert pair effect
(c) Of its amphoteric character
(d) Of its higher reactivity

Answer 1

Answer:

option C

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Answer 2

(b) Of inert pair effect

Explanation:

Thallium shows +1 and +3 oxidation state because of inert pair effect. Inert pair effect is a term used to describe valence electrons in an s orbital penetrating to the nucleus better than electrons in p orbitals, making them more tightly bound to the nucleus due to poor shielding effect offered by the inner sub-shells/orbitals and causing bonds involving these electrons to become unfavorable due to the large promotion energy involved.

Option B is the answer.