Question

# The acidity of ${\mathrm{BF}}_{3}$can 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 conceptThe 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-orbitalAs 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 ${\mathrm{BF}}_{3}$can be explained on the basis of Lewis's Concept.

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