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(D) The chemical formula of orthoboric acid is $H_3BO_3$ or $B(OH)_3$.In $H_3BO_3$,the boron atom is $sp^2$ hybridized,which gives it a trigonal plana

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$7$

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(D) The chemical formula of orthoboric acid is $H_3BO_3$ or $B(OH)_3$.In $H_3BO_3$,the boron atom is $sp^2$ hybridized,which gives it a trigonal planar geometry.The three oxygen atoms and the boron atom lie in the same plane.Additionally,the three hydrogen atoms attached to the oxygen atoms also lie in the same plane due to the planar structure of the $B(OH)_3$ unit.Therefore,all $7$ atoms ($1$ $B$,$3$ $O$,and $3$ $H$) are present in the same plane.

Maximum number of atoms which are present in one plane of $H_3BO_3$?

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