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Q.

Which of the following elements exhibits the most basic properties?

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a

${Br}^{-}$

b

$F^{-}$

c

${Cl}^{-}$

d

$I^{-}$

answer is D.

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Detailed Solution

When we go down the group the size of the elements gets increases. Due to the large the tendency to lose lone is also increases down the group.
Basic nature is defined the tendency to lose lone pair of electrons.
Atomic radii of $I^{-}$ is greater So, the tendency to lose lone pair is also more. Thus, $I^{-}$ exhibits the most basic properties.

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