Which of the following statements are correct | vedclass

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(C) $I$. $P_4$ molecule has a tetrahedral structure with bond angles of $60^{\circ}$,which causes significant angular strain,making it highly reactive

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$I$ and $IV$

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(C) $I$. $P_4$ molecule has a tetrahedral structure with bond angles of $60^{\circ}$,which causes significant angular strain,making it highly reactive. This statement is correct.$II$. The basicity of $H_3PO_3$ is $2$,not $3$,because only the two hydrogen atoms attached to oxygen atoms are ionizable. This statement is incorrect.$III$. In the gas phase,$PCl_5$ has a trigonal bipyramidal structure where axial $P-Cl$ bonds are longer than equatorial $P-Cl$ bonds. This statement is incorrect.$IV$. In the solid state,$PCl_5$ exists as an ionic solid $[PCl_4]^+[PCl_6]^-$,where the cation $[PCl_4]^+$ is tetrahedral and the anion $[PCl_6]^-$ is octahedral. This statement is correct.Therefore,statements $I$ and $IV$ are correct.

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