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Question

According to the Lewis acid-base concept:
  1. species in which the central atom has completed octet can not act as an acid
  2. molecule in which a central atom has vacant d-orbitals available acts as an acid
  3. all positively charged ions are bases
  4. negative charged ions are acids

A
all positively charged ions are bases
B
negative charged ions are acids
C
molecule in which a central atom has vacant d-orbitals available acts as an acid
D
species in which the central atom has completed octet can not act as an acid
Solution
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According to Lewis acid-base concept. the atom which accepts the pair of electron is called Lewis acid and the atom which donate a pair of electron is called a Lewis base.
If the atom has a vacant d-orbital, then it can easily accept a pair of electron and thus, it can act as a Lewis acid.

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