MCQ
Order of electron affinity of $F,\;Cl,\;Br$ and $I$ is .....
- ✓$F < Cl > Br > I$
- B$F > Cl > Br > I$
- C$F < Cl < Br < I$
- D$F > Cl < Br > I$
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Reason : $PbCl_4$ is powerful oxidising agent.



$PCl _{5}( g ) \rightleftharpoons PCl _{3}( g )+ Cl _{2}( g )$
$5$ moles of $PCl _{5}$ are placed in a $200$ $litre$ vessel which contains $2\, moles$ of $N _{2}$ and is maintained at $600 \,K$. The equilibrium pressure is $2.46 \,atm$. The equilibrium constant $K _{ p }$ for the dissociation of $PCl _{5}$ is $......\,\times 10^{-3}$. (nearest integer)
(Given: $R =0.082\, L \,atm \,K ^{-1} \,mol ^{-1}$ : Assume ideal gas behaviour)