Because ClO3- has a lone pair on the central Cl atom, which pushes harder away than a bond would.
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ClO3 has the smaller bond angle than ClO4
Tetrahedral bond angle of a molecule which have a lone pair electron is 107, smaller than regular 109.5, due to the repulsion of electrons of lone pair.
No, the bond angle for linear structure is 180 degrees.
bond angle
The molecular geometry and bond angle of clone is the result of a tetrahedral electron. It is common to be called a bent molecule.