Given below are two statements — Assertion A and Reason R:

Assertion A: In , isomorphous to , the metal is present in +1 oxidation state.

Reason R: Tl metal has fourteen f electrons in its electroni

Question

Given below are two statements — Assertion A and Reason R:

Assertion A: In , isomorphous to , the metal is present in +1 oxidation state.

Reason R: Tl metal has fourteen f electrons in its electronic configuration.

Choose the most appropriate answer:

Canvas Classes · Accepted Answer

Step 1 — Evaluate Assertion A:
 is actually  (cesium triiodide) — Cs is +1 and  is the triiodide ion.
Similarly,  is  — Tl is in +1 oxidation state (not +3).
This is because Tl prefers +1 due to the inert pair effect.
A is correct ✓

Step 2 — Evaluate Reason R:
Tl (Z = 81) has configuration: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹
Tl does have 14 f electrons in its configuration ✓
However, the reason Tl prefers +1 is the inert pair effect (6s² electrons are reluctant to participate in bonding), NOT because of f

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