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Which of the following ions shows the largest tendency to form complexes with  Al3+?

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a
H2O
b
F
c
Cl-
d
SO42-

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detailed solution

Correct option is B

The outermost shell of the fluorine atom has seven electrons, and its valency might also be seven. However, gaining one electron is simpler for fluorine than losing seven electrons. Therefore, the octet's valency is calculated by removing seven electrons, giving fluorine a valency of 1.

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