Correct order of basicity will be:

B I_{3} > B B r_{3} > B C l_{3} > B F_{3}

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C s O H > R b O H > K O H > N a O H

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H_{2} O > H_{2} S > H_{2} S e > H_{2} T e

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N^{2 -} > P^{3 -} > A s^{3 -} > S b^{3 -}

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C s O H > P b O H > K O H > N a O H

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Solution

The correct option is D $C s O H > P b O H > K O H > N a O H$
As we move down the group, the ionization enthalpy decreases while the ionisation enthalpy increases as we move down left to right in a period. As a result, the $M - O H$ bond is more and more easily cleaved and hence the basic strength increases down the group and decreases left to right in a period.

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Similar questions

The correct order of Lewis acidity of $B X_{3}$ molecule is

B F_{3} < B C l_{3} < B B r_{3} < B I_{3}

H_{2} S, H_{2} O, H_{2} S e, H_{2} T e

H_{2} S, H_{2} O, H_{2} S e, H_{2} T e

H_{2} O < H_{2} T e < H_{2} S e < H_{2} S

H_{2} O > H_{2} T e > H_{2} S e > H_{2} S

H_{2} O > H_{2} S > H_{2} S e > H_{2} T e

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