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Stability of monovalent and trivalent cations of $G a, I n, T l$ lie in the following sequence.
i) $G a^{3 +} < I n^{3 +} > T l^{3 +}$ ii) $G a^{3 +} > I n^{3 +} > T l^{3 +}$ iii) $T l^{\oplus} > I n^{\oplus} > G a^{\oplus}$ iv) $G a^{\oplus} > I n^{\oplus} > T l^{\oplus}$

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$i i, i i i$

$i, i i$

$i i i, i v$

$i, i v$

answer is B.

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Detailed Solution

$G a^{+ 3} > I n^{+ 3} > T l^{+ 3}$

$T l^{+} > I n^{+} > G a^{+}$

Inert pair effect.

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