MCQ
Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if  statement is true and $F$ if it is false :
$(I)$ The order of repulsion between different pair of electrons is $l_P - l_P > l_P - b_P > b_P - b_P$
$(II)$ In general, as the number of lone pair of electrons on central atom  increases, value of bond angle from normal bond angle also increases 
$(III)$ The number of lone pair on $O$ in $H_2O$ is $2$ while on $N$ in $NH_3$ is $1$
$(IV)$ The structures of xenon fluorides and xenon oxyfluorides could not be  explained on the basis of $VSEPR$ theory 
  • A
    $TTTF$
  • B
    $TFTF$
  • C
    $TFTT$
  • D
    $TFFF$

Answer

$(b)\,\, (ii)\, (F)$ In general as the number of lone pair of electrons on central atom  increases, value of bond angle from normal bond angle decreases due to  $l_p - l_p > l_p - b_p$

 $(iv) \,(F) $Structures of xenon fluorides and xenon oxyfluoride are explained  on the basis of $VSEPR$ theory. In $SOBr_2, S-O$ bond has maximum bond  length in comparison to $S-O$ bond lengths in $SOF_2$ and $SOCl_2,$ because in $SOBr_2, S-O$ bond has been formed by hybrid orbital containing  less $s-$ character. 

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