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Question

The formal charge on Cl in HClO3 and ClO3 is:

A
0 and -1 respectively
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B
0 and 0 respectively
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C
-1 and -1 respectively
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D
-1 and 0 respectively
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Solution

The correct option is B 0 and 0 respectively
Formal Charge on any atom is calculated as :
Formal charge (FC) = V L B2
where,
V = Total number of valence electrons in the valence shell of the atom.
L = Total number of non bonding (lone pair) electrons of the atom.
B = Total number of bonding (shared) electrons of that particular atom.

HClO3


Formal charge = V L B2 = 72102 = 0

ClO3


Formal charge = V L B2 = 72102 = 0
Thus, formal charge of Cl in HClO3 and ClO3 is 0 and 0 respectively.

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