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** Q 2144167053. ** Consider the flowing reversible system `A(g) + 2B(g) ⇋ AB_2` `Kc = 1/ 2` . The above equilibrium is established in a 1L flask and at equilibrium 2 mol of each A and B are present. If 2 mol of B and 2x mol of `AB_2` is added further so that mol of A does not change then the value of x is