For the following reaction, 2HI(g)⇌H2(g)+I2(g);−QkJ ∆n=(nP)g−(nR)g=(1+1)−2=0 ∴ Equilibrium constant (KC) is independent of pressure and volume. Heat is given in the reaction (∆H=+ ve ) ∴ According to Le-Chatelier's principle, on increasing temperature equilibrium shifts towards left hence, KC decreases. Catalyst only speeds up the reaction i.e., it help to achieves equilibrium faster without effecting the equilibrium point.