QJEEM19Ch01b7: JEE Main 2019 Chemistry - Class 11 JEEM19Ch01b7 Solution: For the chemical reaction X ⇌ Y, the standard reaction Gibbs…

X $$\rightleftharpoons$$ Y

K_eq = $$\frac{\left[Y\right]}{\left[X\right]}$$

If K_eq > 1 $$\Rightarrow$$ [Y] > [X]

and K_eq < 1 $$\Rightarrow$$ [Y] < [X]

We know, $$\mathrm{\Delta }$$G^o = -RT ln(K_eq)

So when K_eq > 1 then $$\mathrm{\Delta }$$G^o < 0 and Y is major.

And when K_eq < 1 then $$\mathrm{\Delta }$$G^o > 0 and X is major.

Temperature at which G^o = 0 is

120 $$-\frac{3}{8}$$ T = 0

$$\Rightarrow$$ T = 320 K

For T > 320 K

$$\mathrm{\Delta }$$G^o < 0 and Y is major.

For T < 320 K

$$\mathrm{\Delta }$$G^o > 0 and X is major.