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Solution


Q.

Which one of the following elements is unable to form MF63- ion                 [2018]
1 Ga  
2 Al  
3 B  
4 In  

Ans.

(3)

Boron does not have vacant d-orbitals in its valence shell, so it cannot expand its covalency beyond 4 i.e., 'B' cannot form the ions like MF63-.