For a reaction in equilibrium, if concentration of product decreases will the reactant concentration increase or decrease ?

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Explanation: 

If you increase the concentration of a product ,equilibrium shifts in the direction that creates more reactant so that system could consume that additional product and reverse is true if the concentration of product decrease it will shift towards the product side to create more product so the equilibrium can be restablished ,so in this case if the concentration of product decreases the reaction proceeds to the left to form more products so in this case the concentration of the reactant decreases . 

Answer: 

Decrease in the concentration of the reactant