According to Lewis acid-base concept, which is a correct statement?
A
Species in which central atom has completed octet can not act as acid.
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B
All negatively charged ions are acids.
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C
Molecule in which the central atom has vacant orbitals acts as acid.
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D
All positively changed ions are bases.
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Solution
The correct option is D Molecule in which the central atom has vacant orbitals acts as acid. According to Lewis acid-base concept, molecule in which the central atom has vacant orbitals acts as acid.