MCQ
Change in entropy is positive for
- A$H_2O_{(g)} \longrightarrow H_2O_{(l)}$
- B$H_2O_{(l)} \longrightarrow H_2O_{(s)}$
- C${N_2} + 3{H_2} \longrightarrow 2N{H_3}$
- ✓$2O_{3(g)} \longrightarrow 3O _{2(g)}$
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Statement $I$: Fluorine has most negative electron gain enthalpy in its group.
Statement $II$: Oxygen has least negative electron gain enthalpy in its group.
In the light of the above statements, choose the most appropriate from the options given below.
$PCl _{5}( g ) \rightleftharpoons PCl _{3}( g )+ Cl _{2}( g )$
$5$ 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)
[At. nos. $Zn = 30, Sc = 21, $$Ti = 22, Cr = 24$]