Question

Consider the chemical reaction in equilibrium.

Answer 1

Answer: A) The direction of the chemical equilibrium will shift to the right, favoring the forward reaction.

Explanation: Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.

This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

For the given equation:

$H_2+I_2+heat\rightleftharpoons 2HI$

This is a type of Endothermic reaction because heat is absorbed in the reaction.

On increasing the temperature, according to the Le-Chatelier's principle, the equilibrium will shift in the direction where decrease in temperature occurs. As this is an endothermic reaction, the temperature is decreasing in forward direction as heat is being absorbed.

Thus on increasing the temperature the reaction will shift in the right and rate of forward direction will increase.

Answer 2

This is an application of Le Chatlier's principle:  What happens when we add a reagent to one side of an equation? The reaction will shift to the other side.  So heat is a reactant and we're adding more of it, the reaction must therefore, shift to the right ( or the products side).