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JEE Main levelOne or more correct optionsDifficulty 2 of 3pt195

Which of the following statements regarding the inert pair effect is/are correct?

A $Tl X^{+}$ is more stable than $Tl X^{3 +}$
B $PbO X_{2}$ is an oxidising agent
CIn group 15, $+ 5$ becomes more stable than $+ 3$ down the group
D $Al X^{+}$ is more stable than $Al X^{3 +}$

Answer: A, B

Thallium prefers

+ 1

and PbO2 reverts to Pb(II), so these statements hold. Down group 15 the

+ 3

state becomes more stable, not

+ 5

, and aluminium, with no inert pair, prefers

+ 3

.

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