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Question

The acidity of BF3can be explained on the basis of one of the following concepts?


A

Arrhenius concept

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B

Bronsted Lowry concept

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C

Lewis concept

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D

Bronsted Lowry as well as Lewis concept

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Solution

The correct option is C

Lewis concept


The explanation for the correct option:

  • Lewis Acids are the chemical species which have empty orbitals and are able to accept electron pairs from Lewis bases.
  • This term was classically used to describe chemical species with a trigonal planar structure and an empty p-orbital
  • As per Lewis’s concept, a positively charged or electron-deficient species that can accept a lone pair of electrons is an acid.

The explanation for incorrect options:

Option A:

  • According to Arrhenius's theory, acid is a substance that gives H+ ion on dissolving in the aqueous solution.
  • It increases the concentration of H+ ions in the solution.
  • The base is a substance that ionizes the OH– ion by dissolving it in the aqueous solution.
  • The concentration of OH- ions is high in the solution.

Option B:

  • According to Bronsted-Lowry theory, acid is a substance which donates an H+ ion or a proton and forms its conjugate base and the base is a substance which accepts an H+ ion or a proton and forms its conjugate acid.

Therefore, the correct option is ‘C’,i.e., the acidity of BF3can be explained on the basis of Lewis's Concept.


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