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Q.

Which of the following statement is not correct?

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a

$C l^{-}$ is a Lewis acid

b

The pH of $10^{- 8}$ M $H C l$ solution is less than 7

c

The ionic product of water at $25^{o} C$ is $10^{- 14}$

d

Bronsted - Lowry theory could not explain the acidic nature of $A l C l_{3}$

answer is A.

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Detailed Solution

$C l^{-}$ is not a Lewis acid. It is a Lewis base. Lewis's base is a substance that has an unshared pair of electrons whereas a substance that has an empty orbital which can accommodate a pair of electrons is called Lewis's acid. A Lewis acid is a chemical species that reacts with a Lewis base to form a Lewis adduct. A Lewis base, then, is any species that donates a pair of electrons to a Lewis acid to form a Lewis adduct.

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Which of the following statement is not correct?