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Q87
(NDA-I/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Consider the following :
I. AlCl3
II. NH3
III. BF3
IV. FeCl 3
How many of the above are Lewis acids?
Result
Your answer:
—
·
Correct:
C
Explanation
A Lewis acid is defined as a chemical species that can accept an electron pair. AlCl3 (Aluminum Chloride) and BF3 (Boron Trifluoride) are classic examples because their central atoms (Al and B) are electron-deficient, possessing only six electrons in their valence shells. FeCl3 (Ferric Chloride) also acts as a Lewis acid because the Fe3+ ion has vacant d-orbitals that can accept electron pairs from Lewis bases. Conversely, NH3 (Ammonia) is a Lewis base because the nitrogen atom has a lone pair of electrons available for donation. Therefore, three of the four listed compounds (I, III, and IV) are Lewis acids.
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