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Variation of equilibrium constan K with ...

Variation of equilibrium constan K with temperature is given by van't Hoff equation
`InK=(Delta_(r)S^(@))/R-(Delta_(r)H^(@))/(RT)`
for this equation, `(Delta_(r)H^(@))` can be evaluated if equilibrium constans `K_(1)` and `K_(2)` at two temperature `T_(1)` and `T_(2)` are known.
`log(K_(2)/K_(1))=(Delta_(r)H^(@))/(2.303R)[1/T_(1)-1/T_(2)]`
For an isomerization `X(g)hArrY(g)` the temperature dependency of equilibrium cohnstant is given by :
`lnK=2-(1000)/T`
The value of `Delta_(r)S^(@)` at `300 K` is :

A

`2` R

B

`2/R`

C

`1000` R

D

None of these

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