Classification of Elements and Periodicity in Properties - Result Question 22
####22. The stability of +1 oxidation state increases in the sequence:
[2009]
(a) $Tl<$ In $<Ga<Al$
(b) In $<Tl<Ga<Al$
(c) $Ga<$ In $<Al<Tl$
(d) $Al<Ga<$ In $<Tl$
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Solution:
- (d) The stability of +1 oxidation state increases from aluminium to thallium i.e.
$Al<Ga<In<Tl$
Inert pair effect is generally exhibited by some heavier nucleus p-block elements with common molecular formula $ns^{2} np^{1-6}$. These elements have less tendency to leave their outer most s-electrons at the time of chemical reaction i.e. electrons present in s-orbital does not participate in the bond formation. For example Tl, Po, Sn, Pb, Bi.
