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TlCl(3) is more stable than TlCl. +1 o...

`TlCl_(3)` is more stable than `TlCl`.
`+1` oxidation state of thallium us more stable than `+3`.

Text Solution

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`Tl^(+1)` is more stable than `Tl^(+3)`. It is due to inert pair effect. With increase in size of atom in a group, the s-electrons present in the outermost orbit are reluctant in involving bond formation.
Hence, in thallium, only p-electron involves in bond formation.
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