STD 12 - p -Block elements - ll — JEE STD 11 Science — Question

For the given reaction, if the initial pressure is $450\,mm Hg$ and the pressure at time $t$ is $720\,mm\,Hg$ at a constant temperature $T$ and constant volume $V$. The fraction of $A ( g )$ decomposed under these conditions is $x \times 10^{-1}$. The value of $x$ is $......$.(nearest integer)

 $C{H_3} - CH = C{H_2}\xrightarrow[{CC{l_4}}]{{B{r_2}}}A\xrightarrow[{(3\,\,moles)}]{{\mathop N\limits^ \oplus  a\mathop N\limits^\Theta  {H_2}}}B\xrightarrow{{C{H_3} - Br}}C\xrightarrow[{{H_2}}]{{Pd + BaS{O_4}}}D$

$(I)$ Number of $S-S$ bonds in $H_2S_nO_6$ are $(n + 1)$

$(II)$ When $F_2$ reacts with water gives $HF, O_2$ and $O_3$

$(III)$ $LiNO_3$ and $BaCl_2$ compounds are used in fire works

$(IV)$ $Be$ and $Mg$ hydrides are ionic and polymeric