Concept:Le Chatelier's principle states that a system at equilibrium responds to a stress by shifting in the direction that opposes the change.
Explanation:For a reversible exothermic reaction, heat can be regarded as a product:
Reactants⇌Products+HeatA decrease in temperature removes heat from the system, just like removing a product.
To compensate for this loss, the equilibrium shifts in the direction that produces heat.
That direction is the forward (exothermic) direction.
Therefore, the forward reaction is favoured and more product is formed.
The equilibrium position consequently moves to the right.
The reaction does not stop, and the equilibrium is not unchanged because the temperature stress alters the balance.
Answer:B. The position of equilibrium shifts to the right.