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The ionic bond A^+ B^- is formed when ...

The ionic bond `A^+` `B^-` is formed when
1) I.E of A is low
2)E.A. of B is high
3) Lattice energy of AB is high
4) Lattice energy of AB is low

A

1 and 2

B

1, 2, 3

C

3 only

D

4 only

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