Chemistry - Chemical Equilibrium Question with Solution | TestHub

The equation for the reaction in the figure below is :
${\text{H}}_2\left(\text{g}\right)+{\text{I}}_2\left(\text{g}\right)+\text{Heat}\rightleftharpoons 2\text{HI}\left(\text{g}\right)$

At instant 3 min, what change was imposed into the equilibrium?